It is very important to supplement calcium in time during pregnancy. Fetal calcium deficiency is prone to congenital rickets or calcium-deficient convulsions, and expectant mothers' calcium deficiency during pregnancy can induce calf convulsions. However, calcium can not be blindly supplemented, otherwise it will not only be unreasonable to supplement calcium, but even bring disadvantages to the health of the baby. Therefore, reasonable calcium supplementation is very important.

Fetal calcium deficiency is easy to get rickets such as beaded ribs, chicken breast or funnel chest, and after birth, it is also easy to suffer from skull softening, abnormal closure of square skull and anterior fontanel, and neonatal congenital thyroid cartilage's malacia, resulting in snoring, because when the newborn inhales, the congenital cartilage curls and contacts with the larynx, which is easy to block the entrance of the larynx and produce snoring, which is very unfavorable to the health of the newborn.

Pregnant mothers with calcium deficiency, if the maternal calcium deficiency is serious, can cause muscle spasm, calf cramps, hand and foot convulsions or numbness, and also lead to osteoporosis of expectant mothers. In addition, calcium deficiency is also manifested as dizziness, anemia, pregnancy-induced hypertension, loose teeth, weakness of limbs, backache and other symptoms.