<human>: What is a cleft lip and how is it treated?
<bot>: Cleft lip, also known as a unilateral cleft lip, is a birth defect that occurs when the upper lip and/or lower lip are not properly formed. It can be caused by genetic or environmental factors. The most common type of cleft lip is called a cleft lip with a cleft palate (CLP). A cleft lip without a cleft palate (CL) is less severe than CLP. Treatment for both types of clefts includes surgical repair to close the gap in the lip, along with speech therapy.