A cleft lip and palate is the most common type of birth defect in the UK. One in every 700 babies is born with a cleft. It's more common in children who are of northern European and Asian origin, and less common in children of African origin.
The cause of clefts is unknown. However, most researchers believe that they are caused by a combination of environmental and genetic factors.
Approximately 25% of affected babies will be born with a cleft lip, 50% will be born with a cleft lip and a cleft palate, and 25% will be born with a cleft palate.
Cleft lips and a combination of a cleft lip and palate are more common in boys. Cleft palates on their own are more common in girls.
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