Http://www.mayoclini: Researchers believe that most cases of cleft lip and cleft palate are caused by an interaction of genetic and environmental factors. In many babies, a definite cause isn't discovered. For details go to...http://www.mayoclinic.com/health/cleft-palate/ds00738/dsection=causesv.
Answered 1/6/2012
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Embryo failure: During the embryonic stage there is a failure of closure of suture lines.
Answered 1/3/2013
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