An oral-facial cleft is a birth defect. It occurs when the lip or the roof of the mouth do not form properly. The defect may include a cleft lip, a cleft palate, or both. A cleft lip is a gap in the upper lip, usually just below the nose. A cleft palate is a gap in the roof of the mouth or in the soft tissue at the back of the mouth. In the majority of cases, a cleft lip and cleft palate occur together.

Infant With Cleft Lip
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Early in pregnancy, all babies have an opening in the lip and palate. As the baby grows, these openings should gradually grow together. By birth, the openings should be closed. For some reason, in children with oral-facial clefts, these openings fail to close. The exact reason these openings do not close is not known.