In particular, in early pregnancy, the embryonic cells are in the differentiation period and are sensitive to external teratogenic factors. Taking X-rays during this period may cause pre-miscarriage or lead to malformation of embryonic development. In the case of confirmed pregnancy, it is better not to take X-rays. If the condition requires, MRI can be done, which is a magnetic field and has little adverse effect on the pregnant woman and the fetus. In the middle and late stages of pregnancy, due to the formation of amniotic fluid, which forms a certain protective effect on the fetus, and the amniotic fluid also has the effect of radiation protection, exposure to a small amount of X-rays in a short period of time generally has less impact on the normal development of the fetus.