title: Maternal obesity and initiation and duration of breastfeeding: data from the longitudinal study of Australian children.
abstract: The aim of this paper is to investigate whether the lower rate of breastfeeding at 6 months by overweight and obese mothers is primarily due to these women giving up breastfeeding in the first week postpartum using a cross-sectional population survey. The sample is children from the infant cohort (about 12 months of age) of Wave 1 (2004) of the Longitudinal Study of Australian Children for whom breastfeeding and maternal information were available (n = 3075). Definitions used: normal-weight body mass index (BMI, kg/m(2)) 20 to <25, overweight BMI 25 to <30, obese BMI > or =30. Breastfeeding initiation was 95.1% for normal-weight women, 92.8% for overweight women and 87.1% for obese women. At 6 months, 64% of normal-weight women were breastfeeding, compared with 54% of overweight and 44% of obese women. On multivariate analysis, for women who initiated breastfeeding, overweight women had an odds ratio (OR) of 1.52 [95% confidence interval (CI) 1.02, 2.28] and obese women had an OR of 2.54 (95% CI 1.70, 3.79) of stopping breastfeeding by 1 week compared with normal-weight women (adjusted for maternal age, education, smoking, level of socio-economic disadvantage, caesarean birth, admission to special care nursery). For women who breastfed for at least 1 week, overweight women had an adjusted OR of 1.26 (1.04, 1.53) and obese women had an adjusted OR of 1.38 (1.10, 1.73) of ceasing to breastfeed before 6 months, compared with normal-weight women. In conclusion, among overweight/obese women who initiate breastfeeding, higher rates of cessation of breastfeeding in both the immediate postpartum period and in the first 6 months contribute to the shorter duration.
authors.affiliation: Murdoch Children's Research Institute, Royal Children's Hospital (Melbourne), Parkville, Vic. 3052, Australia.
authors.forename: Susan M
authors.initials: SM
authors.lastname: Donath
authors.forename: Lisa H
authors.initials: LH
authors.lastname: Amir
mesh_terms: D000293:Adolescent; D000328:Adult; D001315:Australia; D015992:Body Mass Index; D001942:Breast Feeding / Q000453:epidemiology* / Q000706:statistics & numerical data; D015331:Cohort Studies; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D003710:Demography; D004522:Educational Status; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008137:Longitudinal Studies; D008425:Maternal Behavior / Q000523:psychology; D009035:Mothers / Q000523:psychology* / Q000706:statistics & numerical data*; D015999:Multivariate Analysis; D009765:Obesity / Q000523:psychology*; D016017:Odds Ratio; D050177:Overweight; D012907:Smoking; D013997:Time Factors