At the first month postpartum, investigators will visit participants at home, both the control group and the intervention group, for collecting information on breastfeeding practices, for taking a breast milk sample to estimate its fatty acids content, and a blood sample (serum) to obtain the C-Reactive Protein. Also, the investigators will take anthropometric measurements of the children to evaluate their growth (weight, length, and skinfold thickness). Investigators will ask for breastfeeding practices and diet of the participants through a 24 hours recall.