title: Pre-pregnancy BMI, gestational weight gain and breast-feeding: a cohort study in China.
abstract: OBJECTIVE
  The purpose of the present study was to examine the influence of maternal pre-pregnancy BMI and gestational weight gain (GWG) on initiation and duration of infant breast-feeding in a prospective birth cohort study.
  
  
  METHODS
  Breast-feeding information was collected at 1, 3, 6 and 12 months postpartum. The association of pre-pregnancy BMI and GWG with delayed lactogenesis II and termination of exclusive breast-feeding was assessed with logistic regression analysis. The risk of early termination of any breast-feeding during the first year postpartum was assessed with Cox proportional hazards models.
  
  
  METHODS
  Urban city in China.
  
  
  METHODS
  Women with infants from the Ma'anshan Birth Cohort Study (n 3196).
  
  
  RESULTS
  The median duration of any breast-feeding in this cohort was 7·0 months. Pre-pregnancy obese women had higher risks of delayed lactogenesis II (risk ratio=1·89; 95 % CI 1·04, 3·43) and early termination of any breast-feeding (hazard ratio=1·38; 95 % CI 1·09, 1·75) adjusted for potential maternal and infant confounders, when compared with normal-weight women. No differences in breast-feeding initiation or duration of exclusive breast-feeding according to pre-pregnancy BMI were found. Moreover, GWG was not associated with any poor breast-feeding outcomes.
  
  
  CONCLUSIONS
  The present study indicated that pre-pregnancy obesity increases the risks of delayed lactogenesis II and early termination of any breast-feeding in Chinese women.
authors.affiliation: 1Department of Maternal and Child Health,School of Public Health,Anhui Medical University,81 Meishan Road,Hefei 230032,People's Republic of China.
authors.forename: Xing-Yong
authors.initials: XY
authors.lastname: Tao
authors.affiliation: 1Department of Maternal and Child Health,School of Public Health,Anhui Medical University,81 Meishan Road,Hefei 230032,People's Republic of China.
authors.forename: Kun
authors.initials: K
authors.lastname: Huang
authors.affiliation: 3Department of Maternal and Child Health Centres,Ma'anshan Maternity and Child Health Care Hospital,Ma'anshan,People's Republic of China.
authors.forename: Shuang-Qin
authors.initials: SQ
authors.lastname: Yan
authors.affiliation: 1Department of Maternal and Child Health,School of Public Health,Anhui Medical University,81 Meishan Road,Hefei 230032,People's Republic of China.
authors.forename: A-Zhu
authors.initials: AZ
authors.lastname: Zuo
authors.affiliation: 1Department of Maternal and Child Health,School of Public Health,Anhui Medical University,81 Meishan Road,Hefei 230032,People's Republic of China.
authors.forename: Rui-Wen
authors.initials: RW
authors.lastname: Tao
authors.affiliation: 3Department of Maternal and Child Health Centres,Ma'anshan Maternity and Child Health Care Hospital,Ma'anshan,People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Cao
authors.affiliation: 3Department of Maternal and Child Health Centres,Ma'anshan Maternity and Child Health Care Hospital,Ma'anshan,People's Republic of China.
authors.forename: Chun-Li
authors.initials: CL
authors.lastname: Gu
authors.affiliation: 1Department of Maternal and Child Health,School of Public Health,Anhui Medical University,81 Meishan Road,Hefei 230032,People's Republic of China.
authors.forename: Fang-Biao
authors.initials: FB
authors.lastname: Tao
mesh_terms: D000328:Adult; D015992:Body Mass Index; D001942:Breast Feeding; D002681:China / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D009765:Obesity / Q000453:epidemiology*; D049590:Postpartum Period; D011247:Pregnancy; D015995:Prevalence; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D015430:Weight Gain
keywords: BMI; Breast-feeding; Gestational weight gain; Lactogenesis; Pre-pregnancy