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Cleft lip and palate is due to tissues of the face not properly joining together during development. They are a type of birth defect. The cause in most cases is unknown. Risk factors include smoking during pregnancy, diabetes, an older mother, obesity, and certain medications such as some used to treat seizures.
1 Cleft lip and palate may occur separately and in combination. 2  Both malformations occur as a consequence of incomplete fusion of the developing lip (normally occurs by 35 days of gestation) or of incomplete fusion of the hard or soft palate (normally occurs by the eighth to ninth week of gestation).  Share Your Story.