What Causes Cleft Lip and Palate?
Understanding the causes of cleft lip and palate can help answer many questions. Here is what researchers know.
Cleft lip and palate are caused by a combination of genetic and environmental factors. In most cases, there is no single cause.
- Genetic factors:
- About 20β30% of clefts are linked to a specific genetic syndrome
- Many genes are involved in facial development
- If a parent or sibling has a cleft, the risk is slightly higher
- Some ethnic groups have higher rates (Asian, Native American) than others (African descent)
- Environmental factors:
- Maternal smoking during pregnancy (doubles the risk)
- Alcohol consumption during pregnancy
- Certain medications (anti-seizure drugs, some acne medications)
- Maternal nutrition β low folic acid may increase risk
- Maternal diabetes (uncontrolled)
- Viral infections during pregnancy
- How it happens developmentally:
- The lip forms around weeks 4β7 of pregnancy
- The palate forms around weeks 6β9
- If the tissues do not fuse during these windows, a cleft results
Can It Be Prevented?
Taking folic acid before and during pregnancy may reduce the risk. Avoiding smoking and alcohol during pregnancy is also recommended. However, many clefts occur despite optimal prenatal care.
If You Have a Child with a Cleft
- It is not your fault β most clefts have no known preventible cause
- Genetic counseling can help understand recurrence risk
- The risk of having another child with a cleft is about 2β5%
Clinical Guidance
Cleft lip and palate result from a complex mix of genetic and environmental factors. Most cases have no single identifiable cause. Taking folic acid and avoiding smoking/alcohol during pregnancy may reduce risk, but most clefts cannot be prevented.