Vitamin D deficiency during pregnancy can affect the fetal heart. The lack of vitamin d in pregnant women can impair the development and function of the fetal heart, and even affect the normal function of fetal nerve cells, so the lack of vitamin d during pregnancy will affect fetal heart development. At the same time, it should be noted that vitamin d can promote the absorption of calcium, when pregnant women lack vitamin d, it will cause calcium deficiency in the body, thus affecting fetal bone development, can cause fetal congenital diseases, such as congenital rickets, etc., but also after the birth of the teeth eruption impact. And the lack of vitamin D will cause abnormal biological activity of brain cells, affecting the normal development of the fetal nervous system. It is recommended that the lack of vitamin d during pregnancy should be supplemented in a timely manner, and daily consumption of vitamin d-containing foods, such as milk, salmon, etc., pay attention to regular maternity checkups during pregnancy, and if there are any symptoms of discomfort should be treated in a timely manner in order to avoid serious consequences.