What is a harelip? A cleft lip, also known as a cleft lip and palate, is a crack in the lip and roof of the mouth. This kind of cleft may be limited to the lip or may extend to the palate, seriously affecting the child\’s appearance and speech ability, and may be accompanied by other developmental abnormalities. The incidence of harelips is approximately 1-2 per 1,000 births, and there is no difference in prevalence between men and women. The genetic nature of harelips Harelips are hereditary and in most cases are caused by multiple inherited genes. In addition, environmental factors are also