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Small for gestational age (SGA)

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.

Information

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.

A developing baby with intrauterine growth restriction will be small in size and can have problems such as:

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

Alternative Names

Low birth weight

References

Carlo WA. The high-risk infant. In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 97.

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Update Date 9/26/2015

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