Lactobacillus Reuteri DSM17938 in C-Section Infants

Inclusion Criteria: * Gestational age \>37weeks +0 days and \<39 weeks +0 days * Birth weight appropriate for gestational age (AGA) or Large for Gestational Age (LGA) * Apgar score 8 or greater * Children will receive more than 50% of the feeding occasions with human breastmilk * Mothers will have the intention to exclusively or predominantly breastfeed the subject. On the diary report form mother will report day by day the frequency of human lactation and the frequency and amount of infant formula. * Readiness and the opportunity for parents to fill out a study diary, questionnaires. * Parent(s) are willing to postpone major changes in the infant feeding mode, and * Written informed consent from parents Exclusion Criteria: * Older than 24 hours after birth when given the first dose of investigational product * Any kind of chronic or acute diseases during pregnancy that can modify fecal microbiota in children, e.g. gestational diabetes, pre-clampsia, gastrointestinal disease * Congenital malformations or anomalies * Maternal use of antibiotics from gestational week 33 and throughout the study period. * Maternal use of probiotics from gestational week 33 and throughout the study period. * Maternal severe obesity at inclusion or at delivery evaluated using Rosso Madrones centiles * Infant use of antibiotics throughout the study period. * Infant use of probiotics throughout the study period, including infant formula and/or supplementation. * Infants carrying out general anesthesia * Meconium aspiration syndrome * History of premature disruption of membranes for \>24h * Participation in other clinical trials