Methods	A prospective, randomized study conducted in China
Participants	Inclusion criteria: Admitted to the neonatal intensive care unit at a gestational age of 28 weeks, 96 h of age
	Exclusion criteria: Genetic metabolic diseases; congenital major abnormalities; congenital TORCH infections with overt signs at birth; terminal stage of illness (pH 7.0 or hypoxia with bradycardia 2 h); or the lack of parental consent
Interventions	Intervention: Vitamin A, 1500 IU/day and continued if the infant tolerated the milk, for 28 days or until discharge
	Comparison: Placebo
Outcomes	Mortality, NEC
Notes