Prospective Evaluation in Older Premature, Untreated Breast Milk and Milk Processed by the Breast-milk Bank

Inclusion Criteria: * Parent's written informed consent * Gestational age less than 33 weeks of amenorrhea * Hospitalisation in an NICU at the time of inclusion * Intended enteral nutrition with breast milk Exclusion Criteria: * Persons not covered by the French social security system * Major congenital malformation * Participation in other biomedical study protocols * Babies that are likely to be transferred to another hospital during the study period