Alcohol can affect the development of the fetus if you drink during pregnancy preparation. Alcohol can affect the development of the egg and cause miscarriage due to embryonic failure. If you drink after pregnancy, alcohol will enter the fetus through the placenta, which will easily affect fetal development and may lead to fetal developmental malformations, and may also affect fetal intellectual development and cause fetal mental retardation. You should not drink alcohol during the preparation period and early pregnancy to avoid adverse effects, and you need to go to the hospital for regular medical checkups during the preparation period so that you can get pregnant only if you are healthy. The first trimester is a critical period for fetal development, so smoking and drinking can easily affect fetal development and may lead to fetal malformation. It is advisable to take proper exercise and take folic acid to prevent fetal neural tube malformation, and it is also advisable to eat more vegetables and fruits and not to stay up late.