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Kids' Health
http://kidshealth.org/parent/medical/ears/cleft_lip_palate.html#cat138
Orofacial clefts are birth defects in which there is an opening in the lip and/or palate (roof of the mouth) that is caused by incomplete development during early fetal formation.
Cleft lip and cleft palate occur in about 1 or 2 of every 1,000 babies born in the United States each year, making it one of the most common major birth defects. Clefts occur more often in children of Asian, Latino, or Native American descent...