The main phases to develop the study are PHASE 1. INTERVENTION DESIGN PHASE 2. IMPLEMENTATION OF THE INTERVENTION. PHASE 3. FOLLOW-UP The intervention will be offered at 3 times: 1) Educational intervention (a workshop) to pregnant obese women. The workshop will be held by an International Board Certified Lactation Consultant (IBCLC) to promote exclusive breastfeeding and to encourage a better breastfeeding performance in accordance with the WHO recommendations. The workshop will be held at convenient times and will be conducted for groups of 8 to 10 participants; 2) Immediate breastfeeding support at hospital by an IBCLC and; 3) The women will be exposed to early telephonic follow-up during the first week of their children´s life and each month until six months of life. Then, if the breastfeeding continues, each two months until the first year of their children´s life.