Figure 60-1 Plotting birth weight against gestational age for neonates determines whether infants are small, appropriate, or large for gestational age. Babies who are either small or large for gestational age are particularly likely to have a variety of problems such as metabolic, developmental, infectious, or structural abnormalities, as well as drug addiction and withdrawal. (Redrawn with modification from Battaglia FC: Intrauterine growth retardation. Am J Obstet Gynecol 106:1103–1114, 1970.)