A pre-pregnancy test is needed for a third child born by cesarean section to find out about the couple’s physical abnormalities, to avoid potential problems and risks, and to prevent fetal malformations from occurring. The third child born by cesarean section needs pre-pregnancy examination to check the recovery of the uterus, the thickness of the scar, and the presence of diverticula at the scar, and the uniformity of the endometrial echogenicity to minimize the risk of the occurrence of keloidal pregnancy. Pre-conception testing requires the participation of both men and women to detect abnormalities in the body and treat them early. Preconception testing is beneficial in avoiding the birth of children with genetic disorders. When conducting pre-pregnancy checkups for a third child born by cesarean section, you need to go to a regular hospital for a systematic checkup by a professional doctor according to the woman’s own condition to get the most accurate results.