Small for gestational age (SGA) means a developing baby in the womb or an infant is smaller in size than normal for the baby's gender and gestational age .
Low birth weight
Ultrasound is used to find out if a developing baby (fetus) is smaller than normal for age (intrauterine growth restriction). The most widely used definition of SGA is birth weight below the 10th percentile.
A developing baby with intrauterine growth restriction will be small in size and can have problems such as:
Carlo WA. Prematurity and intrauterine growth restriction. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 91.2.