Study duration for each patient Study duration is one year (inclusion time: 9 months) Duration of mother's inclusion:3 days if delivery between 34 and 41+6d weeks of gestation (two blood samples in maternal vein and umbilical vein after delivery and one mother's milk sample on the third day after delivery, D3) 15 days to 3 months if delivery between 24 and 33+6d weeks of gestation (two blood samples in maternal vein and umbilical vein after delivery and mother's milk sample on the third day after delivery,D10-D15, D30, D60 until term age