Micrognathia is a term for a lower jaw that is smaller than normal.
In some cases, the jaw is small enough to interfere with the infant's feeding. Infants with this condition may need special nipples in order to feed properly.
Micrognathia often corrects itself during growth. The jaw may grow a lot during puberty. The problem can be caused by certain inherited disorders and syndromes.
Micrognathia can cause the teeth not to align properly. This can be seen in the way the teeth close. Often there will not be enough room for the teeth to grow.
Children with this problem should see an orthodontist when the adult teeth come in. Because children may outgrow the condition, it often makes sense to delay treatment until a child is older.
Micrognathia may be part of other genetic syndromes, including:
You may need to use special feeding methods for a child with this condition. Most hospitals have programs where you can learn about these methods.
Contact your health care provider if:
The provider will do a physical exam and may ask questions about the problem. Some of these may include:
The physical exam will include a thorough check of the mouth.
The following tests may be performed:
Depending on the symptoms, a child may need to be tested for an inherited condition that may be the source of the problem. The child may need surgery or devices to correct tooth position.
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.