PHASE 3. FOLLOW-UP At a month postpartum, investigators will visit participants at home, both the control group and the intervention group, for information on breastfeeding practices. Also from the mother, a breast milk sample will be taken to determine the composition of fatty acids of it, a blood sample to determine C-Reactive Protein and also investigators will collect dietary information. Then from the child measures on infant growth (weight, length, and skinfold thickness) will be taken. The project staff will be standardized for newborn anthropometric measurement, following the technique of Lohman.