Small for gestational age (SGA)

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Small for gestational age means that a fetus or an infant is smaller or less developed than normal for the baby's gender and gestational age. Gestational age is the age of a fetus or baby that starts on the first day of the mother's last menstrual period.

Alternative Names

Low birth weight


Ultrasound is used to find out if a fetus is smaller than normal for their age. This condition is called intrauterine growth restriction. The most common definition of small for gestational age (SGA) is a birth weight that is below the 10th percentile.


  • Increased red blood cells
  • Low blood sugar
  • Low body temperature



Version Info

  • Last reviewed on 9/26/2015

