Cesarean Section Study

Inclusion Criteria: * written informed consent must be obtained from legal guardian(s) prior to randomization or any study related procedures * healthy newborns * born by Cesarean section * singleton birth * Age at enrollment in the study \< 24h * birth weight ≥ 2500g and ≤ 4300g * gestational age ≥ 37 weeks and ≤ 42 weeks Exclusion Criteria: * congenital diseases or malformations that may inhibit growth * prenatal and/or postnatal diseases * parents are expected to have difficulty complying with the feeding regime * planned re-admittance to the hospital in the first 14 days of life * antibiotic treatment at the time of enrollment in the study