This study aims for an in-depth characterization of human milk of mothers who delivered prematurely to decipher differences with milk of mothers who delivered at the expected term, with a particular focus on milk proteins

Inclusion Criteria:

• Having obtained informed consent
• Group 1 (term delivery): Gestational age between 37 0/7 and not above 41 6/7 weeks
• Group 2 (preterm delivery): Gestational age between 28 0/7 and 32 6/7 weeks
• Age: Mother ≥ 18 years old
• Partial or total breast feeding
• Having a freezer compartment at home (approx. -18°C)
• Good understanding of the French language

Exclusion Criteria:

• Suffering from diabetes (type I or II) before pregnancy
• Alcohol consumption: more than 1 standard drink / day
• Drug addicted
• Subject who cannot be expected to comply with the study procedures.
• Currently participating in an interventional therapeutic clinical trial

Mothers who will breast feed their baby