Excessive intake of alcohol during pregnancy preparation has certain effects on embryos, including the following: 1. Excessive alcohol consumption by men can affect sperm quality and increase the rate of deformed sperm. The combination of deformed sperm and eggs can lead to embryonic dysplasia or fetal malformation. 2. Alcohol is metabolized by the liver, and excessive drinking can damage the liver, which may lead to congenital developmental malformations of the fetal ear and nose. 3. Symptoms such as cerebral edema and pulmonary edema can occur in alcohol intoxication, which can affect fetal brain development and lead to congenital mental retardation of the fetus. During the preparation period, eat a light diet, eat more vegetables and fruits, eat more protein-rich food, exercise appropriately to enhance body resistance, quit smoking and alcohol, do not drink strong tea and coffee, and supplement folic acid to prevent fetal neural tube malformation.