The frequency of fetal malformations accounts for around 3-5% and evaluation of the health of the fetus and screening for fetal malformations has become an important part of prenatal care. Improvements in prenatal diagnosis have allowed identification of malformation in fetuses during first and second trimesters of pregnancy. Prenatal ultrasonography has become routine part of antenatal examination. For development of imaging, the accuracy of diagnosis is getting higher and earlier diagnosis of congenital malformation, such as cleft lip and palate, can provide to parent counseling, and opportunity to prepare the further treatment. For the better understanding of congenital cleft lip diagnosis to the oral and maxillofacial surgeons, as healthcare providers, we reviewed around 19 english-written articles and summarized some knowledges of ultrasound findings in the prenatal cleft lip fetus.