appropriate for gestational age (AGA) infant /əprō″prē·it/ [L, ad, toward, proprius, ownership] , a newborn whose size, growth, and maturation are normal for gestational age, whether delivered prematurely, at term, or later than term. Such infants, if born at term, fall within the average range of size and weight on intrauterine growth curves, measuring from 48 to 53 cm in length and weighing between 2700 and 4000 g. Compare small for gestational age (SGA) infant, large for gestational age (LGA) infant.