Electric mattresses, i.e. electric blankets, have a certain amount of electromagnetic radiation for pregnant women, but not ionizing radiation, so the effect is not very big. 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. Electric blanket may have the following effects on pregnant women: 1. electromagnetic radiation: the working principle of electric blanket is to convert electric energy into heat energy, which will produce electromagnetic radiation, and the long time electromagnetic radiation may affect the breathing and heart rate of pregnant women; 2. fire: the continuous heating of electric blanket will expand the capillaries, which will easily cause the loss of water and inorganic salts in the body, so there will be dry mouth, dry skin, bleeding nostrils, and even constipation. This may affect the growth and development of the fetus; 3, affect sleep: the continuous high temperature of the sleeping environment will reduce the quality of sleep, affect the daily mental state, the mood of pregnant women will affect the growth and development of the fetus; 4, leakage danger: poor quality electric blankets may occur the danger of leakage, women should pay attention to minimize the use of electric blankets during pregnancy.