{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T07:10:44Z","timestamp":1787987444794,"version":"build-2784847793"},"reference-count":31,"publisher":"Georg Thieme Verlag KG","issue":"02","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Am J Perinatol"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>This study aimed to determine optimal gestational weight gain (GWG) considering adverse infant and maternal outcomes among individuals with obesity, with detailed classification for body mass index (BMI) of 40\u2009kg\/m2 or higher.<\/jats:p>\n                  <jats:p>This study was a population-based retrospective cohort study, using U.S. birth certificate data from 2017 to 2021. We included nulliparous individuals with singleton pregnancies delivering live births between 370\/7 and 416\/7 weeks' gestation, excluding those with pregestational diabetes or hypertension, gestational diabetes, preeclampsia, major fetal anomalies, or chromosomal disorders. The study focused on three main outcomes: primary cesarean delivery, small for gestational age (SGA), and large for gestational age (LGA). GWG was evaluated in 2-kg increments, from weight loss &gt;8\u2009kg to gains \u226528\u2009kg. Prepregnancy BMI was stratified into four categories: BMI of 30 to &lt;35, 35 to &lt;40, 40 to &lt;50, and \u226550\u2009kg\/m2. Odds ratios and absolute risk reduction were used to identify GWG ranges with balanced risks for three outcomes within each BMI category.<\/jats:p>\n                  <jats:p>Among 1,677,968 individuals with obesity, increased GWG was associated with higher absolute risks of cesarean delivery and LGA and lower risk of SGA across all BMI categories. Optimal GWG ranges varied by prepregnancy BMI: &gt;12 to \u226414\u2009kg for BMI of 30 to &lt;35\u2009kg\/m2; &gt;10 to \u226412\u2009kg for BMI of 35 to &lt;40\u2009kg\/m2; &gt;6 to \u226410\u2009kg for BMI of 40 to &lt;50\u2009kg\/m2; &gt;0 to \u22648\u2009kg for BMI of 50\u2009kg\/m2 or higher.<\/jats:p>\n                  <jats:p>We identified higher upper and lower GWG limits for individuals with BMI of 30 to 50\u2009kg\/m2, and lower limits for those with BMI \u226550\u2009kg\/m2, compared with the guidelines recommended by the U.S. National Academy of Medicine. These findings suggest the need to tailor GWG recommendations based on the severity of obesity.<\/jats:p>","DOI":"10.1055\/a-2597-8542","type":"journal-article","created":{"date-parts":[[2025,5,1]],"date-time":"2025-05-01T18:41:42Z","timestamp":1746124902000},"page":"172-179","source":"Crossref","is-referenced-by-count":4,"title":["Association of Gestational Weight Gain with Adverse Pregnancy Outcomes in Individuals with Obesity"],"prefix":"10.1055","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2054-4684","authenticated-orcid":false,"given":"Kazuma","family":"Onishi","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, Virginia"},{"name":"Department of Reproductive Medicine, Asada Ladies Clinic, Nagoya, Aichi, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2438-1699","authenticated-orcid":false,"given":"Tetsuya","family":"Kawakita","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, Virginia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"194","published-online":{"date-parts":[[2025,5,21]]},"reference":[{"key":"ref2","doi-asserted-by":"crossref","first-page":"c3428","DOI":"10.1136\/bmj.c3428","article-title":"Overweight and obesity in mothers and risk of preterm birth and low birth weight infants: systematic review and meta-analyses","volume":"341","author":"S D McDonald","year":"2010","journal-title":"BMJ"},{"issue":"48","key":"ref3","doi-asserted-by":"crossref","first-page":"1686","DOI":"10.15585\/mmwr.mm7048a7","article-title":"QuickStats: rate of cesarean delivery, by maternal prepregnancy body mass index category* - United States, 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