Xinhua News Agency, Changsha, September 28 (Xinhua) In recent years, the proportion of fetal and infant deaths caused by birth defects has been on the rise. Experts point out that pregnant women should stay away from these four teratogenic behaviors. Professor Li Bixiang, director of the neonatal surgery department of Hunan Children\’s Hospital, believes that the first three months of pregnancy is the period during which important organs such as the brain, heart, and spine are formed during embryonic development, and is also the period when the fetus matures. The influence of various teratogenic factors is the most obvious. Li Bixiang believes that prevention is innate