NIDCAP based developmental care is a method of looking after preterm infants that is guided by the infant's behavioural cues, and that actively involves parents in the care of their infant. There is limited evidence that outcomes for infants are improved if they receive NIDCAP based care. This study evaluates the effects of introducing NIDCAP based care to a level III neonatal intensive care unit, in the post - surfactant era, and also evaluates its effects on developmental outcomes at age 18 months.