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Small for Gestational Age (SGA)

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Updated January 25, 2014

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Definition: A baby who is in the 10th percentile or below for their gestational age (that is the number of weeks of pregnancy he was born at). SGA is a determination based on comparisons to other babies born at the same gestational age, so it can affect a baby no matter when he was born (full term or premature). Intrauterine growth restriction (IUGR), low birth weight (LBW) or other factors may lead a baby to be small for gestational age.
Also Known As: SGA
Examples:
Our baby was full term but due to IUGR he was considered small for gestational age.

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