Definitions for "Small for gestational age"
An infant who is not as big as could be expected given her gestational age is termed "small for gestational age." SGA babies are small because of slow development, not because they've had less time in the womb, like premature babies.
A birth weight, birth length, or both that is below the 3rd percentile, after adjustment for gestational age and sex.
a newborn is considered small-for-gestational age if her birth weight is below the tenth percentile on the standard growth curve for her age.
a term used to describe a newborn who is smaller than normal for the number of weeks of pregnancy.