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Small for gestational age (SGA)
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Small for gestational age (SGA)

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Low birth weight

Small for gestational age (SGA) means a developing baby in the womb or an infant is smaller in size than normal for the baby's gender and gestational age.

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    Ultrasound is used to find out if a developing baby (fetus) is smaller than normal for age (intrauterine growth restriction). The most widely used definition of SGA is birth weight 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 (polycythemia)
    • Low blood sugar (hypoglycemia)
    • Low body temperature (hypothermia)

Related Information

  Gestational age    

References

Carlo WA. Prematurity and intrauterine growth restriction. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 91.2.

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Review Date: 8/11/2013  

Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

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