OBJECTIVES: To study the effects of lifestyle intervention in pregnancy on weight retention 6 months postpartum among obese women from the "Lifestyle in Pregnancy" (LiP) study, and to determine associations between breastfeeding with postpartum maternal weight. DESIGN: Six months postpartum follow up after a randomized controlled intervention trial. SETTING: Two university hospitals in Denmark. POPULATION: A total of 360 women with pregestational body mass index > 30 kg/m2. METHODS: The intervention involved lifestyle changes (diet and exercise) during pregnancy. The control group received routine pregnancy care. Both groups received standard postnatal care. MAIN OUTCOME MEASURES: Gestational weight gain, postpartum weight retention and breastfeeding. RESULTS: Follow up was completed in 238 women of whom 46% in the intervention group and 57% in the control group had retained weight 6 months postpartum (p = 0.088). Women with gestational weight gain < 9 kg (recommended by the Institute of Medicine), retained less postpartum weight compared with those who exceeded 9 kg (median -0.7 versus 1.5, p < 0.001). Ninety-two percent in both weight gain groups initiated breastfeeding. The number of breastfeeding mothers was higher among women with postpartum weight retention < 5 kg compared with those with weight retention > 5 kg (94% versus 85%, p = 0.034). CONCLUSIONS: We could not detect sustained weight control at 6 months postpartum despite a lower gestational weight gain for obese women during pregnancy who received a lifestyle intervention rather than standard care. Women who adhered to gestational weight gain recommendations had significantly lower postpartum weight retention. Breastfeeding for 6 months was negatively associated with postpartum weight retention.

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