Level 1: Precautions for pregnant women when using electric blankets. In the cold winter, many pregnant women choose to use electric blankets to keep warm. However, pregnant women need to pay attention to the following points when using electric blankets: 1.1 Avoid prolonged use. Prolonged use of electric blankets can easily overheat the body and cause physical discomfort. Therefore, pregnant women should avoid long-term continuous use when using electric blankets. 1.2 Avoid overheating. Overheating will cause the surface temperature of the electric blanket to be too high, which may cause harm to pregnant women.