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Small for gestational age (SGA)

  • Definition
    • 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

  • 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
  • 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.