SCHISIS - CLEFT
Cleft lip (cheiloschisis) and cleft palate (palatoschisis) (colloquially known as harelip), which can also occur together as cleft lip and palate, are variations of a type of clefting congenital deformity caused by abnormal facial development during gestation. A cleft is a fissure or opening—a gap. It is the non-fusion of the body's natural structures that form before birth.
This deformity is most common birth defect. It can be treated perfectly, so these children can have a normal and productive life.
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