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    Micrognathia

    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 is 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.

    Causes

    Micrognathia may be part of other genetic syndromes, including:

    • Cri du chat syndrome
    • Hallerman-Streiff syndrome
    • Marfan syndrome
    • Pierre Robin syndrome
    • Progeria
    • Russell-Silver syndrome
    • Seckel syndrome
    • Smith-Lemli-Opitz syndrome
    • Treacher-Collins syndrome
    • Trisomy 13
    • Trisomy 18
    • XO syndrome (Turner syndrome)

    Home Care

    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.

    When to Contact a Medical Professional

    Contact your health care provider if:

    • Your child seems to have a very small jaw
    • Your child has trouble feeding properly

    What to Expect at Your Office Visit

    The doctor will do a physical exam and may ask questions about the problem. Some of these may include:

    • When did you first notice that the jaw was small?
    • How severe is it?
    • Does the child have trouble eating?
    • What other symptoms are present?

    The physical exam will include a thorough check of the mouth.

    The following tests may be performed:

    • Dental x-rays
    • Skull x-rays

    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.

    References

    Evens K, Hing AV, Cunningham M. Craniofacial and orthopedic conditions. In: Gleason CA, Devaskar SU, eds. Avery’s Diseases of the Newborn. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 95.

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      Review Date: 5/10/2013

      Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

      The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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      St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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