Gut Bacteria and Brain of the Baby

\- Data collection of environmental factors (including maternal nutrition and social level, mode of delivery, birth weight, mode of infant feeding, antibiotic treatments) at the recruitment

\- Collection of maternal feces: the first sample after delivery and once a week during the period of hospitalization of their infant (i.e. 5 to 8 samples per mother)

\- Collection of infant feces: the first sample after birth and once a week during the period of hospitalization of the baby (i.e. 5 to 8 samples per mother) and a sample collected at the corrected age of 1 year and 2 years (i.e. 8 to 10 samples per infant)

\- A food questionnaire completed by the mother the week after delivery,

a food questionnaire on the infant alimentation and food behavior during the period of 2 and 10 months of age, completed by the parents and given to the pediatrician at the medical check-up at the corrected age of 1 year

a food questionnaire on the infant alimentation and food behavior during the period of 12 and 24 months of age, completed by the parents and given to the pediatrician at the medical check-up at the corrected age of 2 years

A sample of 15 mL of milk drunk by the preterm at the 7th postnatal day (if not possible between the 7th and the 10th postnatal days).

\- The 'Ages and Stages Questionnaire' ASQ survey completed by the parents and given to the pediatrician at the corrected age of 2 years medical check-up