Investigators propose this study in order to answer the following research question: An educational intervention and breastfeeding support at postpartum will increase the frequency and total breastfeeding duration in the intervention group? This is a randomized (with control and intervention groups) study, open and parallel (1: 1 ratio between study groups) with 200 pregnant women in the second or third trimester, according to their body mass index (BMI, kg / m2) with excess weight (BMI> 29 pre-pregnancy weight) and that will address their pregnancy in the public health services and hospitals belonging to the Health Ministry of 5 districts: Coyoacán, Magdalena Contreras, Tlalpan, Xochimilco and Alvaro Obregón in Mexico City.