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During the first week of life, 400 IU per day of 25(OH)D3 were given to 126 preterm and 112 full-term, small for date newborn infants, while 1000 UI per day of Vitamin D2 were given to 18 preterm and 27 full-term, small for date newborn infants, in order to compare their effectiveness for the prevention of neonatal hypocalcemia. 67 preterm and 67 full-term newborns were included in the control group. The incidence of late hypocalcemia was reduced from 16.4% to 0 in full-term babies and from 6% to 2.4% in preterm babies by the 25(OH)D3 but not by Vit. D2 administration. The incidence of early hypocalcemia was not modified at all. The Authors suggest 25(OH)D3 administration to prevent the late hypocalcemia and, together with calcium support, to treat the early hypocalcemia in the low birth weight newborn.