The human embryo first develops nerve organs, and the nervous system gradually develops during the embryonic period, eventually developing into the brain and spinal central and peripheral nerves. Since the sperm enters the female fallopian tube and combines with the ovum to form a fertilized egg, it first forms the gestational sac and gradually develops the neural tube, so the fetus grows nerve organs first. Fetal organ development is a process of gradual maturation and perfection, and the neural tube generally develops from the embryonic disk. Therefore, folic acid supplementation is needed in the first trimester of pregnancy, mainly to prevent fetal neural tube malformation. Each stage of fetal growth and development is important, so extra attention is needed to eat a balanced diet, maintain good habits, and during pregnancy, be sure to have regular checkups to observe the development of the fetus.