{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T14:44:42Z","timestamp":1779201882237,"version":"3.51.4"},"reference-count":57,"publisher":"Cambridge University Press (CUP)","issue":"9","license":[{"start":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T00:00:00Z","timestamp":1645401600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":["cambridge.org"],"crossmark-restriction":true},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[2023,5,14]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Evidence of couples\u2019 BMI and its influence on birth weight is limited and contradictory. Therefore, this study aims to assess the association between couple\u2019s preconception BMI and the risk of small for gestational age (SGA)\/large for gestational age (LGA) infant, among over 4\u00b77 million couples in a retrospective cohort study based on the National Free Pre-pregnancy Checkups Project between 1 December 2013 and 30 November 2016 in China. Among the live births, 256\u00a0718 (5\u00b744 %) SGA events and 506\u00a0495 (10\u00b773 %) LGA events were documented, respectively. After adjusting for confounders, underweight men had significantly higher risk (OR 1\u00b717 (95 % CI 1\u00b715, 1\u00b719)) of SGA infants compared with men with normal BMI, while a significant and increased risk of LGA infants was obtained for overweight and obese men (OR 1\u00b708 (95 % CI 1\u00b706, 1\u00b709); OR 1\u00b719 (95 % CI 1\u00b717, 1\u00b720)), respectively. The restricted cubic spline result revealed a non-linear decreasing dose\u2013response relationship of paternal BMI (less than 22\u00b764) with SGA. Meanwhile, a non-linear increasing dose\u2013response relationship of paternal BMI (more than 22\u00b792) with LGA infants was observed. Moreover, similar results about the association between maternal preconception BMI and SGA\/LGA infants were obtained. Abnormal preconception BMI in either women or men were associated with increased risk of SGA\/LGA infants, respectively. Overall, couple\u2019s abnormal weight before pregnancy may be an important preventable risk factor for SGA\/LGA infants.<\/jats:p>","DOI":"10.1017\/s000711452200054x","type":"journal-article","created":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T13:41:18Z","timestamp":1645450878000},"page":"1645-1655","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":13,"title":["Preconception paternal\/maternal BMI and risk of small\/large for gestational age infant in over 4\u00b77 million Chinese women aged 20\u201349 years: a population-based cohort study in 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