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Detailed information about maternal and pregnancy characteristics, including harmful exposures, was gathered prospectively, allowing us to select healthy women with uncomplicated pregnancies without any known harmful exposures. In this cohort we compared the median BW and the proportion of BWs &lt;P3, 5 and 10 or &gt;P90, 95 and 97 according to four reference standards (INTERGROWTH\u201021st, customized according to the method described by Mickolajczyk, Fetal Medicine Foundation and revised Fenton reference) with expected values. Appropriate parametric and nonparametric tests were used, and sensitivity analysis was performed for infant sex, first trimester bookings and women of normal body mass index (BMI). Multiple regression was used to explore effects of confounders. Written consent and ethics approval was obtained.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The cohort included 739 infants. The INTERGROWTH\u201021st standard was closest for the actual BW\u2010distribution and categories. Below\u2010expected BW was associated with boys, younger, shorter, leaner women, lower parity and gravidity. Actual BW was significantly influenced by maternal weight, BMI, parity and gestational age.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Of the four references assessed in this study, the INTERGROWTH\u201021st standard was closest for the actual BW distribution. Maternal variables significantly influence BW.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ijgo.15519","type":"journal-article","created":{"date-parts":[[2024,4,4]],"date-time":"2024-04-04T07:19:58Z","timestamp":1712215198000},"page":"1161-1169","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Selecting a birth weight standard for an indigenous population in a <scp>LMIC<\/scp>: A prospective comparative study"],"prefix":"10.1002","volume":"166","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4703-629X","authenticated-orcid":false,"given":"Lut","family":"Geerts","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Faculty of Medicine and Health Sciences Stellenbosch University  Parow South Africa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6737-8225","authenticated-orcid":false,"given":"Lucy 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