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Which are the most common types of cleft lip?
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The most common type of cleft lip is unilateral cleft lip, which affects about 1 in every 700 babies born. Bilateral cleft lip is much less common and occurs in about 1 out of every 3,000 births. Cleft palate is a rare condition that involves a gap between the roof of the mouth and the back of the throat. It is usually caused by genetic abnormalities or environmental factors during pregnancy.