叶酸是人体必需的维生素,参与核酸、氨基酸、蛋白质及磷脂的代谢与细胞分化、倍增及其功能密切相关。孕妇由于核酸需要量增加及较非孕妇女生理功能出现很大变化等原因,如妊娠早期缺乏叶酸,可导致受精卵着床、细胞分化受阻、胎盘滋养层发育障碍,进而致胚胎发育迟缓、胎停育、流 Folic acid is an essential vitamin in the body. The metabolism of nucleic acids, amino acids, proteins and phospholipids is closely related to cell differentiation, doubling and its function. Pregnant women due to increased nucleic acid requirements and physiological functions than non-pregnant women, such as great changes in other reasons, such as lack of folic acid in early pregnancy, can lead to implantation of fertilized eggs, cell differentiation blocked, placental trophoblastic dysplasia, resulting in embryonic development retardation, fetal Stop breeding, flow