Small for gestational age (SGA) is a term used to describe a baby who is smaller than the usual amount for the number of weeks of pregnancy.
- Small for gestational age (SGA) is below the 10th percentile birthweight after birth.
- Intrauterine growth restriction (IUGR) is diagnosed in a fetus while still inside the uterus.
- Low birth weight (LBW) is defined as an infant with a birth weight of less than 2500 g (5 lb 8 oz), regardless of gestational age at the time of birth.
- Very Low Birth Weight (VLBW) is less than 1500 g, and Extremely Low Birth Weight (ELBW) is less than 1000 g.