The growth and nutrition of 220 very low birth weight infants were reviewed after comprehensive data on all infants in the hospital were entered into the Neonatal Intensive Care Unit Audit Data Base for 2 years prospectively. Fluid and energy (parenteral and oral) intakes were compared in four birth weight categories (1, less than or equal to 750 g; 2, 751 to 1000 g; 3, 1001 to 1250 g; 4, 1251 to 1500 g). Parenteral nutrition was the major source of first nutrition for the small infants, but seldom did it alone provide adequate nutrition for very low birth weight infants. The age of the first nutrition (parenteral and/or oral nutrition other than dextrose) decreased with increasing birth weight. The age of the first oral feedings was later for the infants of the lower birth weights but enteral feeding became the major nutrition for all weight categories by the second week of life. During the first 50 days the infants accumulated a deficit of 3780 to 5460 kJ relative to their estimated need of 504 kJ/kg per day, with the smaller infants accumulating a significantly larger deficit. The growth of infants appropriate for gestational age and of infants small for gestational age differed from each other and from the commonly used graph of Dancis et al (J Pediatr. 1948;33:570-572).