Invisibility of the spine in 4D may be related to the baby’s posture. Generally, the baby can be turned around by changing the position of the pregnant woman and gently pushing the belly of the pregnant woman. If there are developmental abnormalities, they need to be dealt with as early as possible. During the 4D examination, if the fetus is not in a good position, resulting in the spinal development not being able to be clearly seen, the doctor will usually push the pregnant woman’s belly to let the fetus turn on its own, so as to achieve the purpose of exposing the spine. If this method is ineffective, the pregnant woman will usually be asked to move down to the ground for a period of time and then review the examination to stimulate the fetus to move around in the uterus, and change the position of the fetus in the uterus may be able to show clearly. Poor exposure of the fetal spine should be considered in addition to positional obstruction, but also in the case of malformation of the fetal spine. Therefore, it is recommended that pregnant women follow the doctor’s instructions to have regular checkups, and if there are any problems, it is important to go to the hospital in time for checkups, and follow the doctor’s instructions for management and treatment.