Cleft Lip Treatment at Inova Children's Hospital
See also: Cleft palate What is cleft lip? A cleft lip occurs when the right and left sides of the lip fail to grow together as the baby develops in the womb. A cleft lip occurs within the first trimester of pregnancy between the sixth and eighth week of gestation. A cleft may result from a family history (genetic predisposition), a spontaneous change (mutation) of a gene in the case of a syndromic cleft, or exposure to some medication, chemical or infection prenatally. Most often, the cause is never determined and is identified as an isolated incidence.