Vitamin D status and associations in newborn formula-fed infants during initial hospitalization.

In newborn hospitalized infants, vitamin D-3 supplementation of 400 IU/day increased mean 25(OH)D levels from 17 ng/mL at birth to 23.1 ng/mL at discharge. Lower 25(OH)D levels were correlated with hypocalcemia during the first week of life, and elevated parathyroid hormone levels at discharge.