Any deformity or deficiency in the structure of function of the baby seen or recognized at or around the time of birth is called a birth defect. According to the Centers for Disease Control. about one in every 33 babies is born in the United States have a birth defect. Although not all birth defects can be prevented, there are certain preventive steps taken to reduce the chance of having a baby with birth defects.
Birth defects can sway nearly any part of the body (e.g., heart, mind, foot). They may affect how the body examines, works, or both. Birth defects can alter from mild to critical. The well-being of each progeny affected with a birth defect counts mostly on which organ or body part is engaged and how much it is influenced. Depending on the severity of the defect and what body part is influenced, the expected lifespan of a individual with a birth defect may or may not be influenced.
A birth defect can be found before birth, at birth, or any time after birth. Most birth defects are discovered inside the first year of life. Some birth defects such as cleft lip are very simple to glimpse, but other ones (such as heart defects or hearing decrease) are found using special tests, such as echocardiograms (an ultrasound image of the heart), x-rays or hearing checks. discover more about identifying birth defects »
Preventing birth defects
Seps a woman can take to increase her chances of having a healthy child without birth defects:
- Get 400 micrograms (mcg) of folic unpleasant every day, starting at least one month before getting pregnant.
- Don’t drink alcohol, fumes, or use “street” drugs.
- Be cautious on taking unnecessary or harmful medications, encompassing prescription and over-the-counter medications and dietary or herbal supplements. Also converse to a medical practitioner before stopping any medications that are required to heal wellbeing situation.
- discover how to prevent diseases during pregnancy.
Risk factors for birth defects
Birth defects can occur throughout any stage of pregnancy. Most birth defects occur in the first 3 months of pregnancy, when the body parts of the baby are forming. This is a very significant stage of development. although, some birth defects happen later in pregnancy. throughout the last six months of pregnancy, the tissues and body parts extend to augment and evolve. Most birth defects are thought to be initiated by a a combination of factors such as genes (information inherited from our parents), our behaviors, and things in the environment. For some birth defects, we understand the cause. But for most, we don’t.
- Smoking, consuming alcoholic beverage, or taking certain “street” drugs throughout pregnancy.
- Having certain health situation, such as being obese or having uninhibited diabetes before and throughout pregnancy.
- Taking certain medications, such as isotretinoin (a drug used to heal severe acne).
- Having somebody in your family with a birth defect. To learn more about your risk of having a baby with a birth defect, you can converse with a clinical geneticist or a genetic counselor.
- Being an older mother, typically over the age of 34 years.
- Having one or more of these dangers doesn’t signify you’ll have a pregnancy affected by a birth defect. furthermore, women can have a baby born with a birth defect even when they don’t have any of these risks.
It is important to talk to your medical practitioner about what you can do to smaller your risk.
Types of birth defects
There are two main categories of birth defects.
Structural Birth Defects
Structural birth defects are related to a problem with the structure of body parts. These can include:
- Cleft lip or cleft palate
- Heart defects, such as missing or misshaped valves
- Abnormal limbs, such as a clubfoot
- Neural tube defects, such as spina bifida, and problems related to the growth and development of the brain and spinal cord
Functional or Developmental Birth Defects
Functional or developmental birth defects are related to a problem with how a body part or body system works or functions. These problems can include:
- Nervous system or brain problems.These include intellectual and developmental disabilities, behavioral disorders, speech or language difficulties, seizures, and movement trouble. Some examples of birth defects that affect the nervous system include Down syndrome, Prader-Willi syndrome, and Fragile X syndrome.
- Sensory problems. Examples include hearing loss and visual problems, such as blindness or deafness.
- Metabolic disorders. These involve problems with certain chemical reactions in the body, such as conditions that limit the body’s ability to rid itself of waste materials or harmful chemicals. Two common metabolic disorders are phenylketonuria and hypothyroidism.
- Degenerative disorders. These are conditions that might not be obvious at birth but cause one or more aspects of health to steadily get worse. Examples of degenerative disorders are muscular dystrophy and X-linked adrenoleukodystrophy, which leads to problems of the nervous system and the adrenal glands and was the subject of the movie "Lorenzo’s Oil."
Some birth defects affect many parts or processes in the body, leading to both structural and functional problems.
Statistics of birth defects
CDC estimates that birth defects occur in about 1 in every 33 infants born in the United States each year.
Birth defects can occur during any pregnancy, but some factors increase the risk for birth defects. The following situations place pregnant women at higher risk of having a child with a birth defect:
- Lack of folic acid. Women who are pregnant or who could become pregnant should take 400 micrograms of folic acid every day to prevent neural tube defects (NTDs). However, according to the Centers for Disease Control and Prevention (CDC), only 2 out of every 5 women of childbearing age take folic acid every day.
- Drinking alcohol.Drinking alcohol during pregnancy can lead to a variety of problems, including birth defects. For example, using alcohol can lead to fetal alcohol syndrome, which is characterized by intellectual or developmental disability (IDD), physical challenges, and behavioral problems. There is no safe level of alcohol consumption during pregnancy.
- Smoking cigarettes. Smoking cigarettes during pregnancy can lead to a variety of problems, including lung problems such as asthma. Evidence also strongly suggests that certain birth defects, such as problems with the heart and intestines, are caused by smoking during pregnancy.
- Using drugs. Using drugs during pregnancy can increase the risk of various birth defects, including IDDs and behavioral problems, as well as pregnancy loss and stillbirth.
- Medication use. Certain medications are known to cause birth defects if taken during pregnancy. Thalidomide, which is currently used to treat certain cancers and other serious conditions, was once sold as a treatment for morning sickness until it was discovered that it caused severe birth defects. Infants whose mothers took thalidomide had a range of structural and functional problems, including misshapen ears and shortened limbs. Although the thalidomide situation led to much stricter controls on drugs used during pregnancy, the majority of medications currently used by pregnant women have not been tested for safety or efficacy in pregnant women. Addressing this issue is the primary focus of NICHD's Obstetric-Fetal Pharmacology Research Units Network. Women who are pregnant or who might become pregnant should discuss all medications, both prescription and over-the-counter, and supplements they take with their health care providers.
- Infections. Women who get certain infections during pregnancy are at higher risk for having a child with birth defects. Some of the more common infections that are linked to birth defects are cytomegalovirus, a common virus that spreads through body fluids and usually causes no symptoms in healthy people, and toxoplasmosis, a parasitic infection that spreads through contact with cat feces, raw meat, and contaminated food and water. Zika virus infection is linked to microcephaly in newborn babies—a condition in which the brain and skull are smaller than normal. The Pregnancy topic has more information on infections that can cause birth defects and other problems in newborns and on ways to prevent them during pregnancy, and CDC provides tips for preventing infections before and during pregnancy.
- Obesity or uncontrolled diabetes. NICHD research found that the risk of newborn heart defects and neural tube defects increased with maternal obesity. Additional NICHD research suggest that children of obese parents may be at risk for developmental delays. Obesity is also associated with other health problems and long-term health issues. Poorly controlled blood sugar places women at higher risk of having a baby who is too large, has breathing problems, or has other poor health outcomes. These outcomes are likely regardless of whether the woman had diabetes before she got pregnant (type 1 or 2 diabetes) or whether she developed diabetes during pregnancy (gestational diabetes).
- Exposure to things in the environment. Pregnant women who breathe in, eat, drink, or get things into their bodies in other ways may also be at increased risk of birth defects. For example, pregnant women who are exposed to high levels of radiation, such as cancer treatments, are at higher risk for birth defects in their infants. Handling or breathing in certain chemicals can also increase the risk of birth defects.
How do health care providers diagnose birth defects?
Diagnosis of birth defects depends on the specific problem and parts or systems of the body that are affected.
Many structural problems, such as club foot or cleft palate, are detected and diagnosed after a physical examination of the baby immediately after birth. For other conditions, newborn screening or prenatal testing is the only way to detect and diagnose problems.
This information focuses on structural birth defects, their causes, their prevention, and their treatments. Functional/developmental birth defects are addressed more completely in the intellectual and developmental disabilities content and in condition-specific topics.
Newborn screening, a process that tests infants' blood for different health conditions, including many birth defects, provides one method of detecting problems. Newborn screening does not diagnose any specific conditions but detects that a problem may exist. By detecting problems immediately after birth, conditions can be diagnosed and treated before they have lifelong effects.
In addition, newborn screening routinely includes test for hearing problems, as well as pulse oximetry (test of baby's pulse rate and blood oxygen levels) to detect critical congenital heart defects.1
Infants who are at high risk for certain conditions—for example, because of their family history—can undergo additional testing at birth to detect these conditions and treat them if needed. This type of screening has been effective in detecting some cases of Menkes disease, allowing for treatment to begin before health problems occur.
During pregnancy, women have routine tests, such as blood and urine tests, to check for diabetes, signs of infection, or disorders of pregnancy such as preeclampsia. Blood tests also measure the levels of certain substances in a woman's blood that determine the risk of the fetus for certain chromosomal disorders and neural tube defects. Ultrasound screenings, creating a picture using sound, allow providers to view the developing fetus in the womb. Some birth defects, such as spina bifida, are detectable on ultrasounds.
Health care providers recommend that certain pregnant women, including those who are older than 35 years of age and those with a family history of certain conditions, get additional prenatal tests to screen for birth defects. Prenatal detection allows doctors to start treatment as early as possible for some birth defects.
Noninvasive prenatal testing (NIPT)
NIPT is not a routine prenatal test but is used when a routine test suggests that the fetus may have a chromosomal disorder, such as having an extra or missing chromosome in each cell, which occurs in disorders such as Down syndrome, Patau syndrome, and Edwards syndrome.
NIPT analyzes the placental DNA present in the mother's blood; it does not require cell samples from inside the womb.
Currently, experts recommend NIPT only for high-risk pregnancies. This method does not detect open neural tube defects, nor does it predict late pregnancy complications.
Amniocentesis (pronounced am-nee-oh-sen-TEE-sis) is a test that is usually performed to determine whether a fetus has a genetic disorder. In this test, a doctor takes a small amount of fluid from the womb using a long needle. The fluid, called amniotic (pronounced am-nee-OT-ik) fluid, contains cells that have genetic material that is the same as the fetus's genetic material. A laboratory grows the cells and then examines their genetic material for any problems. Some birth defects that can be detected with amniocentesis are Down syndrome and certain types of muscular dystrophy.
There is a slight risk of pregnancy loss with amniocentesis, so women should discuss the procedure with their health care provider before making a decision about the test.
Chorionic Villus Sampling (CVS)
This test extracts cells from inside the womb to determine whether the fetus has a genetic disorder. Using a long needle, the doctor takes cells from the chorionic villi (pronounced KOHR-ee-on-ik VILL-i), which are tissues in the placenta, the organ in the womb that nourishes the fetus. The genetic material in the chorionic villus cells is identical to that of the fetal cells.
Like amniocentesis, CVS can be used to test for chromosomal disorders and other genetic problems. CVS can be done earlier in pregnancy than amniocentesis, but it is also associated with a slightly higher risk of miscarriage than amniocentesis. Women who are considering CVS should discuss the test and the risks with her health care provider.
What are the treatments for birth defects?
Because the symptoms and problems caused by birth defects vary, treatments for birth defects also vary. Treatments range from medications and therapies to surgeries and assistive devices.
This information focuses on structural birth defects, their causes, their prevention, and their treatments. Functional/developmental birth defects are addressed more completely in the intellectual and developmental disabilities content and in the condition-specific topics.
- Steroid medications, such as prednisone, can help people with muscular dystrophy increase muscle strength, ability, and respiratory function and slow the progression of weakness. Physical therapy is also useful for building strength and reducing weakness.
- Infants with cerebral palsy may receive sensory-motor therapy using Velcro-covered "sticky mittens" to help them “snag” and explore objects they are unable to grasp in the hand.
- Assistive devices include orthopedic braces to help patients with limb defects to walk and cochlear implants for hearing impairment.
- In the Management of Myelomeningocele Study (MOMS), conducted through NICHD’s Maternal-Fetal Surgery Network, researchers tested a surgical procedure to correct a severe form of spina bifida while the fetus was still in the womb. Although the surgery itself carried risks, it greatly reduced health complications for the infants who received it, including greater likelihood of being able to walk without assistance. Visit http://nichd.nih.gov/news/resources/spotlight/pages/021011-spina-bifida-MOMS.aspx for more information.
- Gene therapy approaches, in which a gene that is mutated or missing is replaced by a normal version of the gene, are being tested for a variety of genetic disorders. Some examples of disorders that are being treated successfully with gene therapy include genetic disorders of the immune system, the muscles, and the eyes. Recent NICHD-supported research on Duchenne muscular dystrophy used genome editing techniques to improve leg grip strength in a mouse model by “turning on” a gene for a specific protein used in muscles.
Visit clinicaltrials.gov to search for ongoing trials of gene therapies and other treatments for different birth defects and genetic disorders.
If someone in your family has a birth defect, find support and information through these resources, and discuss treatment options with that individual’s health care providers.
- Anophthalmia / Microphthalmia
- Cleft Lip / Cleft Palate
- Congenital Heart Defects
- Diaphragmatic Hernia
- Down Syndrome
- Esophageal Atresia
- Spina Bifida
- Upper and Lower Limb Reduction Defects