The UK incidence of cleft lip and palate is 1 in 700 live births.
Cleft lip is twice as common on the left-side than the right, but no-one knows why.
Cleft lip (+/- palate) is twice as common in boys.
Cleft palate (without lip) is twice as common in girls.
The most common abnormality is an isolated cleft palate (50%).
References: Rennie & Roberton’s Textbook of Neonatology, 5th Ed, 2005. London: Churchill.
CLAPA (Cleft Lip and Palate Association)
Previously published: 23/06/14, 10/06/15