birth weight, the measured heaviness of a baby when born, usually about 3500 g (7.5 pounds). In the United States, 97% of newborns weigh between 2500 g (5.5 pounds) and 4500 g (10 pounds). Babies weighing less than 2500 g at term are considered small for gestational age. Babies weighing more than 4500 g are considered large for gestational age and are often infants of mothers with diabetes mellitus.
