Improving Nutrition for Babies Born by Caesarean Section

Inclusion Criteria: * Breastfeeding mothers: Aged 18 years and older Breastfeeding for less than 6 months Not having taken probiotics in the 6 months prior to sampling Not having taken antibiotics in the 6 months prior to sampling No chronic medical conditions Not undergoing chronic treatment No history of gestational diabetes Body mass index (BMI) below 25 at the start of pregnancy Having given their consent to participate in the study and to the collection of their baby's stool samples Not deprived of liberty or placed under guardianship \- Babies: Aged less than 6 months Born vaginally Born at term or at least 37 weeks of pregnancy Exclusively breastfed Not having received intrapartum antibiotic treatment Having no known medical conditions Not receiving any medical supplements other than conventional vitamins Whose mothers meet the inclusion criteria detailed above Exclusion Criteria: Breastfeeding mothers: * Under the age of 18 * Breastfeeding for 6 months or more * Having been on antibiotic therapy in the 6 months prior to sampling * Having taken probiotics in the 6 months prior to sampling * Having a chronic illness * Undergoing chronic treatment * Who have developed gestational diabetes * Who have a BMI greater than 25 at the start of pregnancy * Who have given their consent to participate in the study (breast milk collection) but not to the collection of their baby's stool samples * Who are deprived of their liberty or under guardianship. Babies: * Aged over 6 months * Born by caesarean section * Born before 37 weeks of pregnancy * Not exclusively breastfed * Having undergone intrapartum antibiotic treatment * Taking medical supplements other than conventional vitamins * Presenting with any type of pathology * Whose mothers meet the non-inclusion criteria detailed above * Receiving medical supplementation other than conventional vitamins