Inclusion Criteria:  Age between 18 and 45 years; Free from chronic non-communicable diseases such as high blood pressure and type 2 diabetes mellitus, except obesity; Free from infectious diseases; Carrying a single fetus; Intention to deliver at Maternity School-Federal University of Rio de Janeiro  Exclusion Criteria:  Smokers; With low weight in early pregnancy (BMI < 18.5 kg/m²). They will be verified by interview, before the signing the informed consent form.