Pregnant women 3 months to start supplementing calcium tablets good. Pregnant women 3 months, the fetus has begun to take shape, the fetus’s bones, teeth, etc. began to grow, fetal calcium demand increases, this is the critical period of fetal growth and development, so this time the need for calcium supplementation, at the same time, due to pregnancy, the mother’s hormone level rises, which can cause osteoporosis and so on, so the mother also need to supplement calcium. Pregnant women after 3 months for the critical period of fetal growth and development, if supplemental calcium is insufficient, can lead to fetal growth and development, rickets and other diseases, but at the same time, do not blindly oversupplementation of calcium, so as to avoid premature calcification of the cranium of the fetus occurs. Calcium supplementation for pregnant women should be taken under the guidance of a professional doctor and should not be taken without authorization.