Electric mattresses, i.e. electric blankets, have a certain amount of electromagnetic radiation for pregnant women, but it is not ionizing radiation, so the effect is not very great. It is recommended that pregnant women turn on the electric blanket to preheat it before going to bed and turn it off when they are ready to sleep. The electric blanket may have the following effects on pregnant women: 1. Electromagnetic radiation: the working principle of the electric blanket is to convert electric energy into heat energy, which will produce electromagnetic radiation when working, and the prolonged electromagnetic radiation may affect the respiration and heart rate of pregnant women; 2. Fire: the continuous heat of the electric blanket will expand the capillaries, which will easily cause the loss of water and inorganic salts in the body, which will lead to the emergence of dry mouth, dry skin, bleeding from the nostrils and even constipation. Even constipation, etc., may affect the growth and development of the fetus; 3, affecting sleep: continuous high temperature sleep environment will reduce the quality of sleep, affect the daily mental state, pregnant women’s emotions will affect the growth and development of the fetus; 4, the danger of leakage: poorer quality electric blankets may leakage of electricity, women should pay attention to minimize the use of electric blankets during pregnancy.