<human>:  Why do some babies have a cleft palate?
<bot>: A cleft palate is a birth defect that occurs when the roof of the mouth is not fully formed. It is caused by a genetic mutation that occurs during the early stages of development. The most common type of cleft palate is called a cleft lip and palate, which is a condition where the roof of the mouth is not fully formed. This can cause a baby to have difficulty feeding and speaking.