Pharmacy Clinical Pearl of the Day: Fetal Macrosoma

A baby with fetal macrosomia weighs more than 8 pounds, 13 ounces.

Clinical Pearl of the Day: Fetal Macrosoma

The term fetal macrosomia is used to describe a newborn who's much larger than average.


  • A baby who is diagnosed as having fetal macrosomia weighs more than 8 pounds, 13 ounces (4000 grams), regardless of gestational age.
  • Approximately 9% of babies worldwide weigh more than 8 pounds, 13 ounces.
  • Risks associated with fetal macrosomia increase greatly when birth weight is more than 9 pounds, 15 ounces (4500 grams).
  • Fetal macrosomia may complicate vaginal delivery and can put the baby at risk of injury during birth.
  • Fetal macrosomia also puts the baby at increased risk of health problems after birth.
  • Symptoms may include the fundal height, which is the length from the top of the uterus to the pubic bone, and excessive amniotic fluid.
  • Causes may be genetic.
  • Risk factors may include maternal diabetes, maternal obesity, previous pregnancies, having a boy, overdue pregnancy, and maternal age.
  • Treatment may include possible C-section, monitoring the mom and the baby after birth, and preventive measures to control the underlying disease conditions the mom and the baby will have.


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