Vitamin D plays an important role in phosphocalcic metabolism and bone homeostasis in newborns. Premature newborns are at risk of vitamin D deficiency and may require supplementation. In this context, the French Society of Pediatrics (Société Française de Pédiatrie) recommends systematic vitamin D testing at 1 month.

The aim of this study was to determine the frequency of vitamin D deficiency in premature newborns.

Inclusion Criteria:

• Premature newborns born at a gestational age less than 32 weeks and/or birth weight less than 1500g
• Having received at least one dosage of 25 OH vitamin D.-

Exclusion Criteria:

• - Newborn whose parents or legal guardian refuse the use of their data for this research

PREMATURE NEWBORN BORN BEFORE 32 WEEKS AND/OR WITH A BIRTH WEIGHT UNDER 1500g