Level 1: Why is radiation protection needed in early pregnancy? Early pregnancy is a critical period for fetal organ development, when the fetus is most sensitive to radiation. Prolonged contact with electronic devices such as computers, mobile phones, and microwave ovens will produce electromagnetic radiation. These radiations can have adverse effects on the fetus, such as malformations, mental retardation and other problems. Therefore, special attention needs to be paid to radiation protection during early pregnancy. Level 2: How to prevent computer radiation? 1. Adjust computer screen brightness and contrast to reduce eye fatigue. 2. Use a radiation shield or apply radiation-proof stickers to reduce the impact of computer radiation on the human body. 3