A hair lip, also known as a cleft lip, is a birth defect that occurs when the lip does not fuse together properly during pregnancy. This can result in a split or separation in the lip, which can range in size from a small notch to a complete separation of the lip.
Hair lips are a relatively common birth defect, affecting approximately one in every 700 babies born in the United States. They can occur on either side of the lip, or both sides, and can be accompanied by other birth defects, such as a cleft palate. Hair lips can be treated with surgery, which can help to improve the appearance of the lip and restore normal function.





