Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Microcephaly (my-kroh-SEF-uh-lee) is a rare neurological condition in which an infant's head is much smaller than the heads of other children of the same age and sex. Sometimes detected at birth, microcephaly often occurs when there is a problem with brain development in the womb or when the brain stops growing after birth.
Microcephaly can be caused by a variety of genetic and environmental factors. Children with microcephaly often have developmental issues. Although there's no treatment for microcephaly, early intervention with speech, occupational and other supportive therapies may help enhance a child's development and improve quality of life.
The primary symptom of microcephaly is having a head size that is much smaller than that of other children of the same age and sex.
Head size is a measure of the distance around the top of the child's head (circumference). Using standardized growth charts, health care providers compare the measurement with other children's measurements in percentiles.
Some children just have small heads, with a measurement that falls below an established value for children of the same age and sex. In children with microcephaly, head size measures much smaller than average for the child's age and sex.
A child with more-severe microcephaly may also have a sloping forehead.
Chances are your health care provider will detect microcephaly at your baby's birth or at a regular well-baby checkup. However, if you think your baby's head is small for the baby's age and sex or isn't growing as it should, talk to your provider.
Microcephaly usually is the result of a problem with brain development, which can occur in the womb (congenital) or during infancy. Microcephaly may be genetic. Other causes may include:
Some children with microcephaly achieve developmental milestones even though their heads will always be small for their age and sex. But depending on the cause and severity of the microcephaly, complications may include:
Learning your child has microcephaly can raise questions about future pregnancies. Work with your health care provider to determine the cause of the microcephaly. If the cause is genetic, you may want to talk to a genetics counselor about the risk of microcephaly in future pregnancies.
To determine if your child has microcephaly, your provider likely will take a thorough prenatal, birth and family history and do a physical exam. Your provider will measure the circumference of your child's head, compare it with a growth chart, and remeasure and plot the growth at future visits. Parents' head sizes also may be measured to determine whether small heads run in the family.
In some cases, particularly if your child's development is delayed, your health care provider may order a head CT scan or MRI and blood tests to help determine the underlying cause of the delay.
Except for surgery for craniosynostosis, there's generally no treatment that will enlarge your child's head or reverse complications of microcephaly. Treatment focuses on ways to manage your child's condition. Early childhood intervention programs that include speech, physical and occupational therapy may help to maximize your child's abilities.
Your health care provider might recommend medication for certain complications of microcephaly, such as seizures or hyperactivity.
When you learn your child has microcephaly, you may feel many different emotions. You may not know what to expect, and you may worry about your child's future. The best remedy for fear and worry is information and support.
Find a team of trusted professionals. You'll need to make important decisions about your child's education and treatment. Create a team of health care providers, teachers, therapists and other professionals who can help you evaluate the resources in your area and explain state and federal programs for children with developmental disabilities.
Your child may require care from several medical specialties, including pediatrics and developmental pediatrics, infectious diseases, neurology, ophthalmology, genetics, and psychology.
If you've just learned your child has microcephaly or you suspect your child's head is too small, you're likely to start by seeing your pediatrician. However, in some cases, your pediatrician may refer you to a pediatric neurologist.
Here's some information to help you and your child get ready for the appointment, and what to expect from the doctor.
Before your child's appointment, make a list of:
You may want to ask about small head size or delayed development. If you're worried about your child's head size, try to get the hat sizes or measure the head circumferences of several first-degree relatives, such as parents and siblings, for comparison.
Take a family member or friend along, if possible, to help you remember the information you're given.
For microcephaly, some basic questions to ask your doctor might include:
Don't hesitate to ask other questions.