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What is a cleft lip?

April 26, 2017Cleft lip

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What is a cleft lip?

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A cleft lip is a separation of the middle (central) portion of the upper lip. It occurs during the first trimester of pregnancy when upper lip tissue fails to completely fuse. The separation can also include the bone of the upper gum and/or the upper jaw. The nose can also be affected. The cleft lip can be unilateral (one sided) or bilateral (two sided). A cleft lip can also be incomplete (stopping just below the nose) or complete (extending through the nostril of the nose). Reprinted from Cleft Lip and Palate: The First Four Years with permission of the Cleft Palate Foundation.