Vitamin D deficiency in pregnant women does not usually lead to fetal abruption; deficiency can lead to rickets, among other things. There is no authoritative literature proving that vitamin D deficiency causes fetal arrest. Possible causes of fetal arrest include luteal insufficiency, smoking, drinking and drug use during pregnancy, uterine abnormalities, rubella or cytomegalovirus infections, and other causes. Vitamin D deficiency may lead to diseases such as hypocalcemia and hypophosphatemia in the mother and fetus, as well as affecting the development of the fetus’ bones, causing diseases such as rickets. Therefore, if vitamin D deficiency exists during pregnancy, it is recommended to take vitamin D supplementation in time. Vitamin D supplementation should be taken under the guidance of a physician, if diarrhea, fatigue, bone pain, hypertension, arrhythmia, myalgia and other adverse reactions, it is recommended to consult a doctor and stop the drug in a timely manner; for hypercalcemia, hypophosphatemia with renal rickets and other conditions of pregnancy is contraindicated in women.