A Neurocognitive and Immunological Study of a New Formula for Healthy Infants

Inclusion Criteria: * Full-term newborns (\>37 weeks and \<41 weeks gestation) * Adequate birth weight for his gestational age (between 3-97 percentiles) * Inclusion age: from 0 to 2 months (60 days) in the formula fed groups * Inclusion age: 2-6 months (180 days) in the breastfeeding group * Maximum 30 days of exclusive breastfeeding in the formula fed groups * From 30 days on, exclusive or \>70% infant formula in the formula fed groups * Normal Apgar score: 7-10 * Umbilical pH ≥ of 7.10 * Availability to continue during the whole study period * Informed consent signed ( parent/legal representative) Exclusion Criteria: * Participating in other studies. * Nervous system disorders (hydrocephalic, perinatal hypoxia, intraventricular hemorrhage, neonatal meningitis, septic shock, West Sd...). * Gastrointestinal disorders (cow's milk protein allergy, lactose intolerance) * Mother's disease history or during pregnancy: neurological and metabolic diseases, diabetes mellitus type 1, hypothyroidism, undernutrition, infections TORCH complex. * Mothers receiving anxiolytic or antidepressant treatment during pregnancy or other potentially harmful drug treatments for infants' neurodevelopment. * Infant's family who in the investigators assessment cannot be expected to comply with the protocol.