A birth defect is a problem that happens while a baby is developing in the mother’s body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

A birth defect may affect how the body looks, works or both. Some birth defects like cleft lip or neural tube defects are structural problems that can be easy to see. To find others, like heart defects, doctors use special tests. Birth defects can range from mild to severe. Causes can include

For most birth defects, the cause is unknown.

Health care providers can diagnose certain birth defects during pregnancy, with prenatal tests. That’s why it important to get regular prenatal care. Other birth defects may not be found until after the baby is born. Sometimes the defect is obvious right away. Other times, the health care provider may not discover it until later in life.

Babies with birth defects often need special care and treatments. The treatments may include surgery, medicines, assistive devices, and therapies.

Centers for Disease Control and Prevention

An abdominal wall defect is an opening in the abdomen through which various abdominal organs can protrude. This opening varies in size and can usually be diagnosed early in fetal development, typically between the tenth and fourteenth weeks of pregnancy. There are two main types of abdominal wall defects: omphalocele and gastroschisis. Omphalocele is an opening in the center of the abdominal wall where the umbilical cord meets the abdomen. Organs (typically the intestines, stomach, and liver) protrude through the opening into the umbilical cord and are covered by the same protective membrane that covers the umbilical cord. Gastroschisis is a defect in the abdominal wall, usually to the right of the umbilical cord, through which the large and small intestines protrude (although other organs may sometimes bulge out). There is no membrane covering the exposed organs in gastroschisis.Fetuses with omphalocele may grow slowly before birth (intrauterine growth retardation) and they may be born prematurely. Individuals with omphalocele frequently have multiple birth defects, such as a congenital heart defect. Additionally, underdevelopment of the lungs is often associated with omphalocele because the abdominal organs normally provide a framework for chest wall growth. When those organs are misplaced, the chest wall does not form properly, providing a smaller than normal space for the lungs to develop. As a result, many infants with omphalocele have respiratory insufficiency and may need to be supported with a machine to help them breathe (mechanical ventilation). Rarely, affected individuals who have breathing problems in infancy experience recurrent lung infections or asthma later in life. Affected infants often have gastrointestinal problems including a backflow of stomach acids into the esophagus (gastroesophageal reflux) and feeding difficulty; these problems can persist even after treatment of omphalocele. Large omphaloceles or those associated with multiple additional health problems are more often associated with fetal death than cases in which omphalocele occurs alone (isolated).Omphalocele is a feature of many genetic syndromes. Nearly half of individuals with omphalocele have a condition caused by an extra copy of one of the chromosomes in each of their cells (trisomy). Up to one-third of people born with omphalocele have a genetic condition called Beckwith-Wiedemann syndrome. Affected individuals may have additional signs and symptoms associated with these genetic conditions.Individuals who have gastroschisis rarely have other birth defects and seldom have chromosome abnormalities or a genetic condition. Most affected individuals experience intrauterine growth retardation and are small at birth; many affected infants are born prematurely.With gastroschisis, the protruding organs are not covered by a protective membrane and are susceptible to damage due to direct contact with amniotic fluid in the womb. Components of the amniotic fluid may trigger immune responses and inflammatory reactions against the intestines that can damage the tissue. Constriction around exposed organs at the abdominal wall opening late in fetal development may also contribute to organ injury. Intestinal damage causes impairment of the muscle contractions that move food through the digestive tract (peristalsis) in most children with gastroschisis. In these individuals, peristalsis usually improves in a few months and intestinal muscle contractions normalize. Rarely, children with gastroschisis have a narrowing or absence of a portion of intestine (intestinal atresia) or twisting of the intestine. After birth, these intestinal malformations can lead to problems with digestive function, further loss of intestinal tissue, and a condition called short bowel syndrome that occurs when areas of the small intestine are missing, causing dehydration and poor absorption of nutrients. Depending on the severity of the condition, intravenous feedings (parenteral nutrition) may be required.The health of an individual with gastroschisis depends largely on how damaged his or her intestine was before birth. When the abdominal wall defect is repaired and normal intestinal function is recovered, the vast majority of affected individuals have no health problems related to the repaired defect later in life.

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