"Scientists are researching methods to prevent cleft lips and cleft palates. One finding, according to research studies, is that mothers who take multivitamins containing folic acid before conception and during the first two months of pregnancy may reduce their risk of giving birth to a baby with a cleft." - content provided by OperationSmile.org (see link below for more information)
As of now, there are no cures for a cleft lip or palate other than surgery after the child has been born.