Cleft lip and cleft palate can occur on one or both sides of the mouth because the lip and the palate develop separately it is possible to have a cleft lip without a cleft palate a cleft palate . Causes cleft lip and cleft palate occur when tissues in the babys face and mouth dont fuse properly normally the tissues that make up the lip and palate fuse together in the second and third months of pregnancy. Cleft lip and cleft palate are birth defects that occur when a babys lip or mouth do not form properly during pregnancy together these birth def ects commonly are called orofacial clefts the lip forms between the fourth and seventh weeks of pregnancy as a baby develops during pregnancy . A cleft lip occurs when there is a split or opening in the lip this opening can be small or large enough to connect the upper lip and nose a cleft palate occurs when the roof of the mouth does . The etiology of cleft lip cl and or cleft palate cp has been extensively studied in industrialized countries and is suggested to be heterogeneous with increasing evidence that both genetic and environmental factors are operating
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