Browsing by Author "Lee ACC"

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    Neonatal mortality risk of vulnerable newborns by fine stratum of gestational age and birthweight for 230 679 live births in nine low- and middle-income countries, 2000-2017.
    (2024-Jan-16) Hazel EA; Erchick DJ; Katz J; Lee ACC; Diaz M; Wu LSF; West KP; Shamim AA; Christian P; Ali H; Baqui AH; Saha SK; Ahmed S; Roy AD; Silveira MF; Buffarini R; Shapiro R; Zash R; Kolsteren P; Lachat C; Huybregts L; Roberfroid D; Zhu Z; Zeng L; Gebreyesus SH; Tesfamariam K; Adu-Afarwuah S; Dewey KG; Gyaase S; Poku-Asante K; Boamah Kaali E; Jack D; Ravilla T; Tielsch J; Taneja S; Chowdhury R; Ashorn P; Maleta K; Ashorn U; Mangani C; Mullany LC; Khatry SK; Ramokolo V; Zembe-Mkabile W; Fawzi WW; Wang D; Schmiegelow C; Minja D; Msemo OA; Lusingu JPA; Smith ER; Masanja H; Mongkolchati A; Keentupthai P; Kakuru A; Kajubi R; Semrau K; Hamer DH; Manasyan A; Pry JM; Chasekwa B; Humphrey J; Black RE; Pediatric Newborn Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.; Child Health Research Foundation, Dhaka, Bangladesh.; Department of Global and Community Health, College of Public Health, George Mason University, Fairfax, Virginia, USA.; Infectious Diseases Research Collaboration, Kampala, Uganda.; Columbia University's Mailman School of Public Health, New York, New York, USA.; Post-Graduate Program in Epidemiology-Federal University of Pelotas, Pelotas, Brazil.; BRAC JP Grant School of Public Health, Dhaka, Bangladesh.; Health Systems Research Unit, South African Medical Research Council, Cape Town, South Africa.; Department of Immunology and Microbiology, Centre for Medical Parasitology, University of Copenhagen, Copenhagen, Denmark.; Section of Infectious Diseases, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts, USA.; Division of Global Health Equity, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.; JiVitA Maternal and Child Health Research Project, Rangpur, Bangladesh.; Department of Food Technology, Safety, and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.; International Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Poverty, Health and Nutrition Division, International Food Policy Research Institute, Washington, District of Columbia, USA.; Research and Development Division, Ghana Health Service, Accra, Ghana.; Department of International Health, Center for Human Nutrition, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Ariadne Labs, Brigham and Women's Hospital and Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Faculty of Medicine and Health Technology, Tampere University and Tampere University Hospital, Tampere, Finland.; College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani, Thailand.; Department of Nutrition, Institute for Global Nutrition, University of California, Davis, California, USA.; Gertrude H Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, USA.; Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA.; Namur University, Namur, Belgium.; Ifakara Health Institute, Dar es Salaam, Tanzania.; Kintampo Health Research Centre, Kintampo, Ghana.; National Institute of Medical Research, Tanga, Tanzania.; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.; Department of Nutrition and Food Science, University of Ghana, Accra, Ghana.; Centre for Health Research and Development, Society for Applied Studies, New Delhi, India.; Aravind Eye Hospital, Madurai, India.; Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Centre, Xi'an, China.; University of Alabama at Birmingham, Birmingham, Alabama, USA.; Department of Food Technology, Safety and Health, Ghent University, Ghent, Belgium.; School of Global and Public Health, Kamuzu University of Health Sciences, Blantyre, Malawi.; George Washington University Milken Institute School of Public Health, Washington, District of Columbia, USA.; HIV and Other Infectious Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa.; ASEAN Institute for Health Development, Mahidol University, Salaya, Thailand.; Belgian Health Care Knowledge Centre, Brussels, Belgium.; Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.; Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA.; Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; College Graduate of Studies, University of South Africa, Pretoria, South Africa.; Department of Infectious Diseases, Copenhagen University Hospital, Copenhagen, Denmark.; Projahnmo Research Foundation, Dhaka, Bangladesh.; Zvitambo Institute for Maternal and Child Health Research, Harare, Zimbabwe.; Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.; Department of Nutrition and Dietetics, School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia.; Department of Global Health, Milken Institute School of Public Health, Washington, District of Columbia, USA.; NNIPS, Kathmandu, Nepal.; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
    OBJECTIVE: To describe the mortality risks by fine strata of gestational age and birthweight among 230 679 live births in nine low- and middle-income countries (LMICs) from 2000 to 2017. DESIGN: Descriptive multi-country secondary data analysis. SETTING: Nine LMICs in sub-Saharan Africa, Southern and Eastern Asia, and Latin America. POPULATION: Liveborn infants from 15 population-based cohorts. METHODS: Subnational, population-based studies with high-quality birth outcome data were invited to join the Vulnerable Newborn Measurement Collaboration. All studies included birthweight, gestational age measured by ultrasound or last menstrual period, infant sex and neonatal survival. We defined adequate birthweight as 2500-3999 g (reference category), macrosomia as ≥4000 g, moderate low as 1500-2499 g and very low birthweight as <1500 g. We analysed fine strata classifications of preterm, term and post-term: ≥42 MAIN OUTCOME MEASURES: Median and interquartile ranges by study for neonatal mortality rates (NMR) and relative risks (RR). We also performed meta-analysis for the relative mortality risks with 95% confidence intervals (CIs) by the fine categories, stratified by regional study setting (sub-Saharan Africa and Southern Asia) and study-level NMR (≤25 versus >25 neonatal deaths per 1000 live births). RESULTS: We found a dose-response relationship between lower gestational ages and birthweights with increasing neonatal mortality risks. The highest NMR and RR were among preterm babies born at <28 weeks (median NMR 359.2 per 1000 live births; RR 18.0, 95% CI 8.6-37.6) and very low birthweight (462.8 per 1000 live births; RR 43.4, 95% CI 29.5-63.9). We found no statistically significant neonatal mortality risk for macrosomia (RR 1.1, 95% CI 0.6-3.0) but a statistically significant risk for all preterm babies, post-term babies (RR 1.3, 95% CI 1.1-1.5) and babies born at 37 CONCLUSIONS: In addition to tracking vulnerable newborn types, monitoring finer categories of birthweight and gestational age will allow for better understanding of the predictors, interventions and health outcomes for vulnerable newborns. It is imperative that all newborns from live births and stillbirths have an accurate recorded weight and gestational age to track maternal and neonatal health and optimise prevention and care of vulnerable newborns.
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    Neonatal mortality risk of vulnerable newborns: A descriptive analysis of subnational, population-based birth cohorts for 238 203 live births in low- and middle-income settings from 2000 to 2017.
    (2023-May-08) Hazel EA; Erchick DJ; Katz J; Lee ACC; Diaz M; Wu LSF; West KP; Shamim AA; Christian P; Ali H; Baqui AH; Saha SK; Ahmed S; Roy AD; Silveira MF; Buffarini R; Shapiro R; Zash R; Kolsteren P; Lachat C; Huybregts L; Roberfroid D; Zhu Z; Zeng L; Gebreyesus SH; Tesfamariam K; Adu-Afarwuah S; Dewey KG; Gyaase S; Poku-Asante K; Boamah Kaali E; Jack D; Ravilla T; Tielsch J; Taneja S; Chowdhury R; Ashorn P; Maleta K; Ashorn U; Mangani C; Mullany LC; Khatry SK; Ramokolo V; Zembe-Mkabile W; Fawzi WW; Wang D; Schmiegelow C; Minja D; Msemo OA; Lusingu JPA; Smith ER; Masanja H; Mongkolchati A; Keentupthai P; Kakuru A; Kajubi R; Semrau K; Hamer DH; Manasyan A; Pry JM; Chasekwa B; Humphrey J; Black RE; Child Health Research Foundation, Dhaka, Bangladesh.; Department of Global and Community Health, College of Public Health, George Mason University, Fairfax, Virginia, USA.; South African Research Chair in Social Policy at College Graduate of Studies, University of South Africa, Pretoria, South Africa.; Infectious Diseases Research Collaboration, Kampala, Uganda.; Columbia University's Mailman School of Public Health, New York, New York, USA.; BRAC JP Grant School of Public Health, Dhaka, Bangladesh.; Health Systems Research Unit, South African Medical Research Council, Cape Town, South Africa.; Section of Infectious Diseases, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts, USA.; Division of Global Health Equity, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.; JiVitA Maternal and Child Health Research Project, Rangpur, Bangladesh.; Department of Food Technology, Safety, and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.; Post-Graduate Program in Epidemiology - Federal University of Pelotas, Pelotas, Brazil.; International Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Poverty, Health and Nutrition Division, International Food Policy Research Institute, Washington, District of Columbia, USA.; Research and Development Division, Ghana Health Service, Accra, Ghana.; Department of International Health, Center for Human Nutrition, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Ariadne Labs, Brigham and Women's Hospital and Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Faculty of Medicine and Health Technology, Tampere University and Tampere University Hospital, Tampere, Finland.; College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani, Thailand.; Department of Nutrition, Institute for Global Nutrition, University of California, Davis, California, USA.; Gertrude H Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, USA.; Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA.; Namur University, Namur, Belgium.; Ifakara Health Institute, Dar es Salaam, Tanzania.; Kintampo Health Research Centre, Kintampo, Ghana.; Centre for Medical Parasitology, Department of Immunology and Microbiology, University of Copenhagen, and Department of Infectious Diseases, Copenhagen University Hospital, Copenhagen, Denmark.; National Institute of Medical Research, Tanga, Tanzania.; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.; Pediatric Newborn Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.; Department of Nutrition and Food Science, University of Ghana, Accra, Ghana.; Centre for Health Research and Development, Society for Applied Studies, New Delhi, India.; Aravind Eye Hospital, Madurai, India.; Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Centre, Xi'an, China.; University of Alabama at Birmingham, Birmingham, Alabama, USA.; Department of Food Technology, Safety and Health, Ghent University, Ghent, Belgium.; School of Global and Public Health, Kamuzu University of Health Sciences, Blantyre, Malawi.; George Washington University Milken Institute School of Public Health, Washington, District of Columbia, USA.; HIV and Other Infectious Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa.; ASEAN Institute for Health Development, Mahidol University, Salaya, Thailand.; Belgian Health Care Knowledge Centre, Brussels, Belgium.; Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.; Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA.; Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Projahnmo Research Foundation, Dhaka, Bangladesh.; Zvitambo Institute for Maternal and Child Health Research, Harare, Zimbabwe.; Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.; Department of Nutrition and Dietetics, School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia.; Department of Global Health, Milken Institute School of Public Health, Washington, District of Columbia, USA.; NNIPS, Kathmandu, Nepal.; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
    OBJECTIVE: We aimed to understand the mortality risks of vulnerable newborns (defined as preterm and/or born weighing smaller or larger compared to a standard population), in low- and middle-income countries (LMICs). DESIGN: Descriptive multi-country, secondary analysis of individual-level study data of babies born since 2000. SETTING: Sixteen subnational, population-based studies from nine LMICs in sub-Saharan Africa, Southern and Eastern Asia, and Latin America. POPULATION: Live birth neonates. METHODS: We categorically defined five vulnerable newborn types based on size (large- or appropriate- or small-for-gestational age [LGA, AGA, SGA]), and term (T) and preterm (PT): T + LGA, T + SGA, PT + LGA, PT + AGA, and PT + SGA, with T + AGA (reference). A 10-type definition included low birthweight (LBW) and non-LBW, and a four-type definition collapsed AGA/LGA into one category. We performed imputation for missing birthweights in 13 of the studies. MAIN OUTCOME MEASURES: Median and interquartile ranges by study for the prevalence, mortality rates and relative mortality risks for the four, six and ten type classification. RESULTS: There were 238 203 live births with known neonatal status. Four of the six types had higher mortality risk: T + SGA (median relative risk [RR] 2.6, interquartile range [IQR] 2.0-2.9), PT + LGA (median RR 7.3, IQR 2.3-10.4), PT + AGA (median RR 6.0, IQR 4.4-13.2) and PT + SGA (median RR 10.4, IQR 8.6-13.9). T + SGA, PT + LGA and PT + AGA babies who were LBW, had higher risk compared with non-LBW babies. CONCLUSIONS: Small and/or preterm babies in LIMCs have a considerably increased mortality risk compared with babies born at term and larger. This classification system may advance the understanding of the social determinants and biomedical risk factors along with improved treatment that is critical for newborn health.
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    Vulnerable newborn types: analysis of subnational, population-based birth cohorts for 541 285 live births in 23 countries, 2000-2021.
    (2023-May-08) Erchick DJ; Hazel EA; Katz J; Lee ACC; Diaz M; Wu LSF; Yoshida S; Bahl R; Grandi C; Labrique AB; Rashid M; Ahmed S; Roy AD; Haque R; Shaikh S; Baqui AH; Saha SK; Khanam R; Rahman S; Shapiro R; Zash R; Silveira MF; Buffarini R; Kolsteren P; Lachat C; Huybregts L; Roberfroid D; Zeng L; Zhu Z; He J; Qiu X; Gebreyesus SH; Tesfamariam K; Bekele D; Chan G; Baye E; Workneh F; Asante KP; Kaali EB; Adu-Afarwuah S; Dewey KG; Gyaase S; Wylie BJ; Kirkwood BR; Manu A; Thulasiraj RD; Tielsch J; Chowdhury R; Taneja S; Babu GR; Shriyan P; Ashorn P; Maleta K; Ashorn U; Mangani C; Acevedo-Gallegos S; Rodriguez-Sibaja MJ; Khatry SK; LeClerq SC; Mullany LC; Jehan F; Ilyas M; Rogerson SJ; Unger HW; Ghosh R; Musange S; Ramokolo V; Zembe-Mkabile W; Lazzerini M; Rishard M; Wang D; Fawzi WW; Minja DTR; Schmiegelow C; Masanja H; Smith E; Lusingu JPA; Msemo OA; Kabole FM; Slim SN; Keentupthai P; Mongkolchati A; Kajubi R; Kakuru A; Waiswa P; Walker D; Hamer DH; Semrau KEA; Chaponda EB; Chico RM; Banda B; Musokotwane K; Manasyan A; Pry JM; Chasekwa B; Humphrey J; Black RE; Department of Statistics, Kintampo Health Research Centre, Kintampo, Ghana.; Centre for Medical Parasitology, Department for Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.; Infectious Diseases Research Collaboration, Kampala, Uganda.; Health Systems Research Unit, South African Medical Research Council, Cape Town, South Africa.; Department of Obstetrics & Gynaecology, University of Colombo, Colombo, Sri Lanka.; Section of Infectious Diseases, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts, USA.; Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University and Tampere University Hospital, Tampere, Finland.; Health Specialist PMTCT and Pediatric AIDS, UNICEF, Lusaka, Zambia.; Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden.; Aravind Eye Care System, Madurai, India.; Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Research Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa.; Institute for Global Health Sciences and Department of Obstetrics and Gynecology, University of California San Francisco, San Francisco, California, USA.; College Graduate of Studies, University of South Africa, Johannesburg, South Africa.; IntraHealth International, Dhaka, Bangladesh.; Projahnmo Research Foundation, Dhaka, Bangladesh.; Nepal Nutrition Intervention Project - Sarlahi (NNIPS), Kathmandu, Nepal.; Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Department of Pediatric Newborn Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.; JiVitA Maternal and Child Health Research Project, Rangpur, Bangladesh.; Department of Health Policy Planning and Management, Makerere University School of Public Health, New Mulago Hospital Complex, Kampala, Uganda.; Department of Obstetrics and Gynecology, Columbia University Medical Center, New York, New York, USA.; Division of Birth Cohort Study, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, China.; Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK.; Kintampo Health Research Centre, Research and Development Division, Kintampo, Ghana.; Medicine Department, Faculty of Medicine, University of Namur, Namur, Belgium.; Department of Paediatrics and Child Health, The Aga Khan University, Karachi, Pakistan.; Poverty, Health and Nutrition Division, International Food Policy Research Institute, Washington, DC, USA.; Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.; Argentine Society of Paediatrics, Ciudad Autónoma de Buenos Aires, Argentina.; Department of Maternal, Newborn, Child and Adolescent Health and Ageing, World Health Organization, Geneva, Switzerland.; Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.; Department of Nutrition and Food Science, University of Ghana, Accra, Ghana.; University of Alabama at Birmingham, Birmingham, Alabama, USA.; Department of Global Health, Milken Institute School of Public Health, Washington, DC, USA.; Department of Population Medicine, College of Medicine, QU Health, Qatar University, Doha, Qatar.; Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.; ASEAN Institute for Health Development, Mahidol University, Salaya, Thailand.; Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA.; Division of Global Health Equity & Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.; Department of Disease Control, Faculty of Infectious & Tropical Diseases, London School of Hygiene & Tropical Medicine, London, UK.; Department of Infectious Diseases, University of Melbourne, Doherty Institute, Melbourne, Victoria, Australia.; Department of Nutrition and Dietetics, School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia.; Institute for Global Nutrition, Department of Nutrition, University of California, Davis, California, USA.; Child Health Research Foundation, Dhaka, Bangladesh.; The Aga Khan University, Karachi, Pakistan.; Department of Global and Community Health, College of Public Health, George Mason University, Fairfax, Virginia, USA.; Division of Global Health, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden.; Indian Institute of Public Health, Public Health Foundation of India, Bengaluru, India.; Menzies School of Health Research, Charles Darwin University, Darwin, Northern Territory, Australia.; University Obstetrics Unit, De Soysa Hospital for Women, Colombo, Sri Lanka.; Ariadne Labs, Brigham and Women's Hospital and Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; University of Ghana School of Public Health, Accra, Ghana.; College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani, Thailand.; Gertrude H Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, USA.; Institute for Global Health Sciences, Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California, USA.; Ifakara Health Institute, Dar es Salaam, Tanzania.; National Institute for Medical Research, Dar es Salaam, Tanzania.; Department of Food Technology, Safety and Health, Ghent University, Ghent, Belgium.; School of Global and Public Health, Kamuzu University of Health Sciences, Blantyre, Malawi.; National Institute of Perinatology, Maternal-Fetal Medicine Department, Mexico City, Mexico.; School of Public Health, College of Medicine and Health Sciences, University of Rwanda, Kigali, Rwanda.; Department of Obstetrics and Gynecology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.; Addis Continental Institute of Public Health, Addis Ababa, Ethiopia.; Department of Obstetrics and Gynecology, St. Paul's Hospital Millennium Medical College, Addis Ababa, Ethiopia.; Institute for Maternal and Child Health - IRCCS 'Burlo Garofolo', WHO Collaborating Centre for Maternal and Child Health, Trieste, Italy.; National Institute for Medical Research, Tanga Centre, Tanga, Tanzania.; Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China.; Centre for Health Research and Development, Society for Applied Studies, Delhi, India.; Department of Global Health, Milken Institute School of Public Health, George Washington University, Washington, DC, USA.; Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.; HIV and Other Infectious Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa.; Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil.; Ministry of Health Zanzibar, Zanzibar, Tanzania.; Department of Biological Sciences, School of Natural Sciences, University of Zambia, Lusaka, Zambia.; Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.; Zvitambo Institute for Maternal and Child Health Research, Harare, Zimbabwe.; CIDRZ; Centre for Infectious Disease Research in Zambia (CIDRZ)
    OBJECTIVE: To examine prevalence of novel newborn types among 541 285 live births in 23 countries from 2000 to 2021. DESIGN: Descriptive multi-country secondary data analysis. SETTING: Subnational, population-based birth cohort studies (n = 45) in 23 low- and middle-income countries (LMICs) spanning 2000-2021. POPULATION: Liveborn infants. METHODS: Subnational, population-based studies with high-quality birth outcome data from LMICs were invited to join the Vulnerable Newborn Measurement Collaboration. We defined distinct newborn types using gestational age (preterm [PT], term [T]), birthweight for gestational age using INTERGROWTH-21st standards (small for gestational age [SGA], appropriate for gestational age [AGA] or large for gestational age [LGA]), and birthweight (low birthweight, LBW [<2500 g], nonLBW) as ten types (using all three outcomes), six types (by excluding the birthweight categorisation), and four types (by collapsing the AGA and LGA categories). We defined small types as those with at least one classification of LBW, PT or SGA. We presented study characteristics, participant characteristics, data missingness, and prevalence of newborn types by region and study. RESULTS: Among 541 285 live births, 476 939 (88.1%) had non-missing and plausible values for gestational age, birthweight and sex required to construct the newborn types. The median prevalences of ten types across studies were T+AGA+nonLBW (58.0%), T+LGA+nonLBW (3.3%), T+AGA+LBW (0.5%), T+SGA+nonLBW (14.2%), T+SGA+LBW (7.1%), PT+LGA+nonLBW (1.6%), PT+LGA+LBW (0.2%), PT+AGA+nonLBW (3.7%), PT+AGA+LBW (3.6%) and PT+SGA+LBW (1.0%). The median prevalence of small types (six types, 37.6%) varied across studies and within regions and was higher in Southern Asia (52.4%) than in Sub-Saharan Africa (34.9%). CONCLUSIONS: Further investigation is needed to describe the mortality risks associated with newborn types and understand the implications of this framework for local targeting of interventions to prevent adverse pregnancy outcomes in LMICs.