If you want to have a healthy and smart baby, both men and women need to work together, starting from the details of daily life. Here are four habits couples should avoid during pregnancy. 1. Men take saunas before pregnancy. Before expecting a child, expectant fathers sometimes go to a sauna or drive for a long time and sit on a steaming cushion. Experts remind: When wanting to have a baby, expectant fathers should not take saunas from the first 3 months. Because overheating temperature will affect the quality of sperm in the testicles, resulting in a decrease in the quality of fertilized eggs, affecting the health of the baby. 2. Many women use whitening cosmetics during pregnancy.