The study will include the following neonatal and pediatric components: 1. In all cases, neonatal data will be collected during the initial post-delivery stay. This will include the following variables: a. INITIAL STAY AFTER DELIVERY - length at birth and discharge - weight at birth and discharge - head circumference at birth and discharge, - enteral feeding data and parenteral nutrition throughout admission - nutrition related labs - APGAR scores - medications- lasix, chlorothiazide, dopamine, hydrocortisone and dexamethasone - morbidities such as necrotizing enterocolitis, patent ductus arteriosus, spontaneous intestinal perforation, intraventricular hemorrhage, sepsis, and chronic lung disease b. 1 MONTH POST DELIVERY - length - weight - head circumference - demographic, socioeconomic, and nutritional information c. 6 MONTHS POST DELIVERY - length - weight - head circumference d. 12 MONTHS POST DELIVERY - length - weight - head circumference e. 18 MONTHS POST DELIVERY - length - weight - head circumference - the Bayley Scales of Infant Development II by a certified practitioner Subject participation will be approximately 1 1/2 years.