The Efficacy and Safety of Early Vitamin AD Supplementation in Very Preterm Infants

In Vitamin AD group, the very preterm infants will receive the daily vitamin AD with vitamin A at 1500 IU/day and vitamin D at 500 IU/day in drop form added to their enteral feeds when minimal feeding is introduced, and continue to 28 days or discharge. In this group ,the patient also will receive standard intravenous multivitamin preparation (1 ml/kg/d,containing VA 230 IU/kg/d, VD 80 IU/kg/d) within daily on parenteral nutrition until fed 120ml/kg.

In this group ,the patient will only receive standard intravenous multivitamin preparation (1 ml/kg/d,containing VA 230 IU/kg/d, VD 80 IU/kg/d) within daily on parenteral nutrition until fed 120ml/kg.