Congenital hypothyroidism
What is Congenital hypothyroidism?
Congenital hypothyroidism is a condition where a baby is born with low levels of thyroid hormone. The thyroid is a small gland in the neck that makes hormones to control how the body uses energy. When a baby does not make enough thyroid hormone from birth, it can affect growth and brain development.
Most babies with congenital hypothyroidism appear healthy at birth. This is because they receive some thyroid hormone from their mother during pregnancy. However, without early detection and treatment, the condition can lead to serious developmental delays and intellectual disabilities. Newborn screening programs test all babies within the first few days of life to catch this condition early.
When caught and treated early, children with congenital hypothyroidism can grow and develop normally. Treatment involves taking thyroid hormone medication every day, usually for life. The key is identifying the condition before symptoms develop and starting treatment right away.
Symptoms
- Prolonged jaundice, which causes yellowing of the skin and eyes
- Poor feeding and difficulty sucking
- Excessive sleepiness and low energy
- Constipation and infrequent bowel movements
- Poor muscle tone and a floppy appearance
- Hoarse crying or weak cry
- Swollen tongue that may stick out
- Cool, pale, or mottled skin
- Large soft spots on the skull that close slowly
- Umbilical hernia, which is a bulge near the belly button
Many babies with congenital hypothyroidism show no obvious symptoms at birth. This is why newborn screening is so important for early detection.
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Causes and risk factors
Congenital hypothyroidism happens when the thyroid gland does not develop properly before birth or does not make enough hormone. The most common cause is a thyroid gland that is missing, too small, or located in the wrong place in the neck. In some cases, the thyroid gland is present but cannot make thyroid hormone properly due to a genetic defect. Rarely, the condition is caused by problems with the pituitary gland, which tells the thyroid how much hormone to make.
Risk factors include being born prematurely, having a family history of thyroid disorders, or being of Asian, Hispanic, or Native American descent. Girls are twice as likely as boys to have congenital hypothyroidism. In most cases, the condition occurs randomly and is not inherited from parents. However, some genetic forms can run in families.
How it's diagnosed
Congenital hypothyroidism is diagnosed through newborn screening, which tests a few drops of blood from a heel prick within the first 24 to 48 hours of life. If screening results are abnormal, doctors order follow-up blood tests to measure thyroid hormone levels. The key test is free T4, which measures the active form of thyroid hormone in the blood. Doctors also check thyroid stimulating hormone, or TSH, which shows how hard the body is working to make thyroid hormone.
Rite Aid offers testing that includes free T4 to help monitor thyroid function. If your child was diagnosed with congenital hypothyroidism and requires ongoing monitoring, our testing can track thyroid hormone levels. Early and regular testing ensures that treatment is working and hormone levels stay in the healthy range.
Treatment options
- Daily thyroid hormone replacement medication, usually levothyroxine, starting as soon as possible after diagnosis
- Regular blood tests to monitor thyroid hormone levels and adjust medication doses as the child grows
- Giving medication at the same time each day, typically in the morning before feeding
- Working closely with a pediatric endocrinologist, a doctor who specializes in hormone disorders in children
- Ensuring proper nutrition to support growth and development
- Attending all follow-up appointments to track developmental milestones
- Adjusting medication doses as needed based on blood test results and growth patterns
Concerned about Congenital hypothyroidism? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Congenital hypothyroidism is usually caused by a thyroid gland that did not develop properly before birth. The gland may be missing, too small, or in the wrong location. Sometimes the thyroid is present but cannot make hormone due to a genetic defect. In rare cases, problems with the pituitary gland cause the condition.
All newborns in the United States receive a screening test within the first few days of life. A few drops of blood from a heel prick are tested for thyroid hormone levels. If results are abnormal, doctors order follow-up blood tests to confirm the diagnosis. Early detection through newborn screening is critical for preventing developmental problems.
Congenital hypothyroidism cannot be cured, but it can be successfully managed with daily medication. Children take thyroid hormone replacement, usually levothyroxine, for their entire lives. When started early and monitored properly, treatment allows children to grow and develop normally. Most people with the condition live healthy, active lives.
Without treatment, congenital hypothyroidism leads to severe intellectual disabilities and delayed physical development. Children may experience stunted growth, learning difficulties, and permanent brain damage. This is why newborn screening and early treatment are so important. Starting medication within the first two weeks of life prevents these serious complications.
Infants typically need blood tests every 1 to 2 months during the first year of life to ensure medication doses are correct. As children get older, testing becomes less frequent, usually every 3 to 6 months. Regular blood tests are essential to monitor thyroid hormone levels and adjust medication as the child grows. Your doctor will create a testing schedule based on your child's needs.
Free T4 is the active form of thyroid hormone that circulates in the blood and is available for the body to use. It controls metabolism, growth, and brain development. Low free T4 levels in newborns indicate congenital hypothyroidism. Measuring free T4 helps doctors diagnose the condition and monitor whether treatment is working properly.
Yes, with early diagnosis and proper treatment, children with congenital hypothyroidism can live completely normal lives. They can attend regular schools, participate in sports, and pursue any career they choose. The key is taking medication every day and having regular blood tests to ensure hormone levels stay healthy. Most people with the condition have no limitations on their activities.
When taken at the correct dose, thyroid hormone medication has very few side effects. It simply replaces the hormone the body should be making naturally. If the dose is too high, children may become restless, have trouble sleeping, or experience a rapid heartbeat. Regular blood tests help doctors adjust the dose to avoid side effects.
Most cases of congenital hypothyroidism occur randomly and are not inherited. However, some genetic forms can run in families. If you have a child with congenital hypothyroidism, talk to your doctor about whether future children are at higher risk. Genetic counseling may be helpful for families with multiple affected members.
If you miss a dose, give it as soon as you remember on the same day. If you do not remember until the next day, give the regular dose and do not double up. Contact your doctor if you miss multiple doses or have questions about your child's medication schedule. Consistent daily medication is important for maintaining stable thyroid hormone levels.