Birth defect

Some babies are born with changes. These changes can be in the body. Some parts might look different. Other parts might work differently.

These changes can be small. They can also be large. Some changes happen to how a body part is shaped. Other changes happen to how a body part works.

Doctors can find these changes early. They use tests to look for them. Some changes show up right at birth. Others are found before the baby is born.

Many things can cause these changes. They may come from a mix of things. Some come from the way a baby grows. Others come from things a mother touches or eats.

Doctors have many ways to help. They can use medicine or special tools. Some children use therapy to help them grow. This helps every child live their best life.

A birth defect is a condition present at birth. It can change how a body part looks or works. These are called structural or functional disorders. Structural disorders change the shape of a body part. Functional disorders change how a part works. Some defects involve both types.

Many things can cause these changes. They often come from a mix of factors. Some come from genes or chromosomes. Others come from things a mother is exposed to. This includes certain medicines or chemicals. These harmful substances are called teratogens. For example, the drug thalidomide caused many limb defects. Vitamin A can also cause issues if taken in too much. Other risks include smoking or drinking alcohol. Diabetes that is not well controlled is also a risk.

Doctors can find many defects early. They use screening tests before a baby is born. Some defects are seen right at birth. Treatment depends on the defect. It may include surgery, medicine, or therapy. It can also use assistive technology to help.

A birth defect is a condition that is present when a baby is born. These conditions can change how a body part looks or how it works. Doctors group them into two main types. Structural disorders change the shape of a body part. Functional disorders change how a body part performs its job. Some functional disorders are called metabolic disorders, which affect how the body uses energy. Some defects might be both structural and functional. These conditions can be mild or they can be very severe.

Many different things can cause these changes to happen. Most birth defects come from a complex mix of factors. Some are caused by problems with genes or chromosomes. Others happen because of things a mother is exposed to during pregnancy. This includes certain infections or specific chemicals. These harmful substances are known as teratogens. A mother might also face risks from things like smoking or drinking alcohol. Not having enough folate can also be a risk factor. Having poorly controlled diabetes is another factor that matters.

Scientists and doctors study these causes to help prevent them. One famous example involves a drug called thalidomide. It was made near the end of the 1950s to help with sleep and nausea. It was used in almost 50 countries between 1956 and 1962. Sadly, it caused many children to be born with limb defects. This helped doctors realize how drugs can act as teratogens. Another example is Vitamin A. While it is a vitamin, taking too much can be harmful to a growing baby. Even a single dose of certain versions can cause serious issues.

There are many important numbers to know about these conditions. Birth defects affect about 96 million people around the world. In the United States, they occur in about 3% of newborns. In 2015, these defects resulted in about 628,000 deaths. This number was lower than the 751,000 deaths recorded in 1990. The most common cause of death was congenital heart disease. This accounted for 303,000 deaths. Neural tube defects caused about 65,000 deaths.

We can see how these facts connect to the world around us. Doctors use screening tests to find defects before a baby is born. Some defects are visible right at birth. Once a defect is found, there are many ways to help. Treatment might include surgery to fix a shape. It might also include medicine or special therapy. Some people use assistive technology to help them live well. By understanding these causes, doctors can better support families and new babies.

A birth defect is an abnormal condition present at the time of birth. These conditions can affect how a person looks or how their body functions. They may result in physical, intellectual, or developmental disabilities. These disabilities vary widely in their impact, ranging from mild to severe. Birth defects are generally classified into two main categories. Structural disorders involve problems with the actual shape of a body part. Functional disorders involve problems with how a body part works, such as metabolic or degenerative disorders. Some conditions may involve both structural and functional issues.

Understanding the mechanism of how these defects occur is complex. Many birth defects result from a mix of genetic, environmental, and behavioral factors. Genetic or chromosomal disorders can change the instructions for building a body. Environmental factors include exposure to certain chemicals or infections during pregnancy. Behavioral factors involve the mother's health and habits. For example, folate deficiency or poorly controlled diabetes can increase risk. Drinking alcohol or smoking during pregnancy are also significant risk factors. In some cases, a specific sequence of events causes multiple effects in a set order.

Scientists categorize structural anomalies based on how they develop. A malformation is a disorder of tissue development, often occurring in the first trimester. A dysplasia is a disorder at the organ level caused by tissue development problems. A deformation arises from mechanical stress on normal tissue, often during the second or third trimester. This can be caused by oligohydramnios, which is a lack of amniotic fluid. A disruption involves the breakdown of tissues that were already formed correctly. These distinctions help doctors understand when and how the development went wrong.

There are many specific types of structural disorders. Limb anomalies are called dysmelia and include conditions like polydactyly, which is having extra fingers or toes. Other examples include syndactyly, where digits are fused together. Congenital heart defects are common and include atrial septal defects or tetralogy of Fallot. The nervous system can also be affected by neural tube defects like spina bifida or anencephaly. Other neurological issues include hydrocephalus, which involves fluid buildup in the brain. Gastrointestinal and urinary tract systems can also show various forms of stenosis or atresia.

History has shown how certain substances act as teratogens. A teratogen is any agent, such as a drug or toxin, that causes a birth defect. One famous example is the drug thalidomide. Developed in the late 1950s, it was used in nearly 50 countries to treat nausea. Between 1956 and 1962, it caused severe malformations in 8,000 to 10,000 children. Many of these children suffered from phocomelia, a condition affecting the long bones of the limbs. This discovery helped scientists recognize the power of teratogenic drugs.

Other substances like Vitamin A can also be dangerous. While essential, certain forms like isotretinoin are very strong teratogens. Even a single dose can lead to serious issues like microphthalmia, or small eyes. Similarly, the antibiotic tetracycline can impact bone and teeth mineralization. Some research also suggests that paternal factors matter. Animal studies show that paternal alcohol exposure can correlate with decreased offspring birth weight. It may also increase the risk of ventricular septal defects in offspring.

Birth defects have a significant global impact. They affect approximately 96 million people worldwide. In the United States, they occur in about 3% of all newborns. In 2015, these conditions resulted in about 628,000 deaths. This was a decrease from 751,000 deaths recorded in 1990. Congenital heart disease caused the highest number of deaths at 303,000. Neural tube defects followed, accounting for 65,000 deaths.

Modern medicine provides many ways to support those with birth defects. Some conditions are visible at birth, while others are found through prenatal screening tests. Treatment is tailored to the specific defect. It may include surgery to correct a structural issue like a cleft palate. Therapy and medication can help manage functional or developmental needs. Assistive technology can also help individuals navigate the world. By studying these connections, researchers continue to find ways to prevent and treat these conditions.