It is especially important to pay attention to the early stages of pregnancy because at this time, there are not many problems, so one should be cautious about daily life and diet. It is recommended to pay more attention to the supplementation of nutrients such as vitamin A, calcium, and iron during the early stages of pregnancy.

1, Vitamin A – If pregnant women take an excessive amount of vitamin A, it can not only cause miscarriage but also may lead to fetal neural and cardiovascular defects and facial malformations. Extra supplementation is only necessary if a confirmed vitamin A deficiency is present. Generally, a reasonable diet can provide 5000 to 8000 international units of vitamin A per day, which not only fully meets the needs of pregnant women but also meets the daily requirement of 8000 international units of vitamin A for lactating women.

Vitamin C – If pregnant women consume an excessive amount of vitamin C (more than 1000mg per day), it can affect the development of the embryo because large doses of vitamin C are prone to form an ‘acidic constitution’ in the body, which is unfavorable for the development of reproductive cells, and long-term excessive intake can also cause scurvy in the fetus after birth.

2, Vitamin D – If taken in excess (more than 15 milligrams per day), it can cause hypercalcemia in the fetus, leading to narrowing of the aorta and renal arteries, hypertension, and delayed intellectual development. Moreover, folic acid, which we often mention, can affect the absorption of zinc and cause zinc deficiency if taken in excess (more than 1mg per day); it can lead to delayed fetal development, an increase in low-birth-weight infants; and it may also mask a deficiency of vitamin B12, causing damage to the nervous system; it can interfere with the action of anticonvulsant drugs and trigger seizures.