Symbiotic & Colonization

Inclusion Criteria: * Healthy newborn infant * Full term infant (≥ 37 weeks gestation; ≤ 42 weeks gestation) * Age of infant is between 14 days at the time of enrollment * Birth weight between 2500g and 4500g * For the Formula fed groups: The infant's mother has elected, before the 14th day of their child's life, not to continue breastfeeding (no breastfeeding after the 14th day of the child's life) For the Breastfed group: The infant's mother has elected to fully breastfeed her baby, from enrollment to at least 3 months of age * Having obtained his/her legal representative's informed consent Exclusion Criteria: * Congenital illness or malformation that may affect normal growth * Significant pre-natal and/or post-natal disease * Re-hospitalization for more than 2 days in the first 14 days of life. (Exceptionally, infants re-hospitalized because of jaundice may be enrolled in the study). * Newborn who have received antibiotics during the first 14 days of life * Receiving infant formula containing pro and/or prebiotics at the time of enrolment * Newborn whose parents / caregivers cannot be expected to comply with treatment * Newborn currently participating in another clinical trial