After the authorization and signature of the Informed Consent Form - ICF - (Attachment I) are given by the mother or legal responsible, such person must go to the Institution on the scheduled date for the collection of a blood sample and to deliver of a stool sample, collected as per prior orientation. The interviewer shall complete a questionnaire to obtain information on the birth and gestational history and current information on the child. A single blood sample will be collected for analysis of vitamins A and D, calcium, iron, ferritin, hemoglobin, zinc, selenium, alkaline phosphatase and lipids (cholesterol - total and fractions - and triglycerides), and a stool sample will be collected for analysis of parasites and microbiota in the feces.