Precautions for 1-3 months of pregnancy include supplementing folic acid, supplementing nutrition, paying attention to rest, and avoiding unfavorable events. 1. Folic acid supplementation: Folic acid tablets should be taken during the first three months of pregnancy. This is an important stage in the growth and development of the embryo, and the embryo’s demand for folic acid is relatively high, so additional supplementation of folic acid can prevent fetal neural tube deformities. 2. Supplementary nutrition: 1-3 months of pregnancy should pay attention to nutritional supplementation, some women due to pregnancy reaction nausea, vomiting symptoms, usually can eat small meals to supplement nutrition, eat protein-rich, vitamin-rich foods, such as milk, eggs, beef, apples and so on. 3. Pay attention to rest: 1-3 months of pregnancy should pay attention to rest, this stage of the embryo in the uterus in the bed is not stable, usually can not be too tired, every day to ensure adequate sleep, try to avoid staying up late at night. 4. Avoid unfavorable events: 1-3 months of pregnancy to avoid doing things that are not conducive to the growth and development of the fetus, such as randomly taking drugs, smoking, drinking, drug use, contact with radioactive or chemical substances, which may increase the chances of fetal deformity development. There are more precautions to be taken during the first three months of pregnancy, and you can consult your doctor at the hospital to learn more about them; if you experience any discomfort, you should consult your doctor in a timely manner so as not to delay your condition.