Patients will receive either bLF (10 mg/Kg/day) (Westland Co-operative Dairy Company, New Zealand) or placebo (starch) as control. The dosage of bLF is based on the mean hLF intake that very low body weight neonates ingest with mother's fresh milk in the first 2 weeks of life (30-150 mg/d) [16] and bLF 200 mg bid is found to be effective to suppress Helicobacter pylori [17]. Drug administration will begin within 24 hours after RCC admission and will last for 6 weeks or until discharge. Medication and nutritional support will be prescribed as the medical routine.