Neonatal Hypothyroidism
Definition
Neonatal hypothyroidism is decreased thyroid hormone production in a newborn. In very rare cases, no thyroid hormone is produced.
If the baby was born with the condition, it is called congenital hypothyroidism. If it develops soon after birth, it is called hypothyroidism acquired in the newborn period.
Alternative Names
Cretinism; Congenital hypothyroidism; Hypothyroidism - infants
Causes, incidence, and risk factors
Hypothyroidism in the newborn may be caused by:
A missing or poorly developed thyroid gland
A pituitary gland that does not stimulate the thyroid gland
Thyroid hormones that are poorly formed or do not work
A thyroid gland that is not fully developed is the most common defect. It occurs in about 1 out of every 3,000 births. Girls are affected twice as often as boys.
References
LeFranchi S. Hypothyroidism. In: Kliegman RM, Stanton BF, St. Geme III JW, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011;chap 559.
Review Date: 6/28/2011
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
Alternative Names
Cretinism; Congenital hypothyroidism; Hypothyroidism - infants
Symptoms
Most affected infants have few or no symptoms, because their thyroid hormone level is only slightly low. However, infants with severe hypothyroidism often have a unique appearance, including:
Dull look
- Puffy face
- Thick tongue that sticks out
This appearance usually develops as the disease gets worse.
The child may also have:
- Choking episodes
- Constipation
- Dry, brittle hair
- Jaundice
- Lack of muscle tone (floppy infant)
- Low hairline
- Poor feeding
- Short height
- Sleepiness
- Sluggishness
Signs and tests
A physical exam may show:
- Decreased muscle tone
- Failure to grow
- Hoarse-sounding cry or voice
- Short arms and legs
- Very large soft spots on the skull (fontanelles)
- Wide hands with short fingers
- Widely separated skull bones
Blood tests will be done to check thyroid function. Other tests that may be done include:
References
LeFranchi S. Hypothyroidism. In: Kliegman RM, Stanton BF, St. Geme III JW, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011;chap 559.
Review Date: 6/28/2011
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
Alternative Names
Cretinism; Congenital hypothyroidism; Hypothyroidism - infants
Treatment
Early diagnosis is very important. Most of the effects of hypothyroidism are easy to reverse.
Thyroxine is usually given to treat hypothyroidism. Once the child starts taking this medicine, blood tests are regularly done to make sure thyroid levels are in a normal range.
Expectations (prognosis)
Getting diagnosed early usually leads to a good outcome. Newborns who are diagnosed and treated in the first month or so usually have normal intelligence.
Untreated mild hypothyroidism can lead to severe mental retardation and growth retardation. The nervous system goes through important development during the first few months after birth. A lack of thyroid hormone can cause damage that cannot be reversed.
Complications
- Mental retardation
- Growth retardation
- Heart problems
Calling your health care provider
Call your health care provider if:
References
LeFranchi S. Hypothyroidism. In: Kliegman RM, Stanton BF, St. Geme III JW, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011;chap 559.
Review Date: 6/28/2011
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
Alternative Names
Cretinism; Congenital hypothyroidism; Hypothyroidism - infants
Prevention
If a pregnant women takes radioactive iodine for thyroid cancer, the thyroid gland may be destroyed in the developing fetus. Infants whose mothers have taken such medicines should be observed carefully after birth for signs of hypothyroidism.
Most states require a routine screening test to check all newborns for hypothyroidism. See also: Newborn screening tests
References
LeFranchi S. Hypothyroidism. In: Kliegman RM, Stanton BF, St. Geme III JW, Schor NF, Behrman RE, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011;chap 559.
Review Date: 6/28/2011
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
Review Date: 6/28/2011
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.