Microcephaly and How It Affects Babies


Elizabeth Hanes, RN

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You may have seen the unsettling pictures on television: babies with very small heads born to mothers infected with the Zika virus. How does this condition--called microcephaly--affect those infants? And is there any way to avoid causing microcephaly in your unborn child? Here are a few key facts about this uncommon condition.

What is microcephaly?

With microcephaly, a baby’s skull and brain stop growing either while in the womb or during the first couple of years after birth. This condition is rare; the Centers for Disease Control and Prevention estimates between 2 and 12 babies per 10,000 in the United States are born with microcephaly.

A baby with microcephaly may be born with a nearly complete skull or with a very small skull. The smaller the baby’s head is, the more limitations the child will experience. Depending on severity, microcephaly can cause:

  • Seizures
  • Cognitive impairments
  • Developmental delays
  • Impaired motor function
  • Poor coordination and balance
  • Dwarfism

Babies with mild cases of microcephaly may experience virtually no adverse effects. These children may exhibit normal intelligence and development, with little impairment.

Does anything cause microcephaly besides the Zika virus?

While the outbreak of Zika in the U.S. and around the world is bringing attention to microcephaly, the condition can arise for a variety of reasons--or for no known reason, as is usually the case. The most common known causes of microcephaly include the exposure of pregnant women to:

  • Infections, such as rubella (German measles), toxoplasmosis (a parasite often found in cat feces), chicken pox, or the Zika virus
  • Malnutrition
  • Heavy metals like lead and arsenic
  • Traumatic injury to the brain before birth and during infancy
  • Certain chemicals, possibly including those in cigarettes
  • Alcohol

It’s worth noting, too, some cases of microcephaly occur due to genetic abnormalities in the child. Down syndrome, for example, can cause head deformities.

Can my doctor test my baby for microcephaly before it’s born?

Unlike some conditions, such as those caused by chromosomal abnormalities, there is no way to test the blood or amniotic fluid for microcephaly specifically. Sometimes, the condition can be seen during a late-pregnancy