The critical period of fetal brain development can be roughly divided into three periods according to growth and developmental characteristics: before 8 weeks, 20-30 weeks, and 30 weeks to birth, which can vary slightly from fetus to fetus. 1. before 8 weeks of pregnancy: fetal brain cells develop gradually, the neuroembryo is formed at 19 days, and the closure starts to arise from the bottom around 26 days, and extends downward to the spinal cord, and the fetal brain already has a basic The fetal brain has a basic shape by the 8th week. During this period, the brain is prone to malformations and fetal neural tube malformations should be prevented; pay attention to avoid drinking strong tea and coffee, catching a cold, taking drugs, the occurrence of viral infectious diseases, avoiding exposure to X-rays, abstaining from smoking and alcohol, nutritious diet, increasing the intake of fish, nuts and other foods, which are beneficial to fetal brain development; 2. 20-30 weeks of pregnancy: fetal brain cells begin to proliferate, hearing and vision begin to appear slowly, and the brain cell structure becomes more and more complex. The brain cell structure becomes more and more complex, a period of rapid proliferation occurs, and fetal movement also begins to appear. This stage is suitable to give the fetus appropriate stimulation, such as listening to soothing music, gently chatting with the fetus, which helps to help the development of brain function; 3, 30 weeks of pregnancy to birth: neurons and other important components of the fetal nervous system will continue to develop, gradually complete and coordinate brain and neurological functions, pregnant women should maintain a good nutritional status, you can moderate daily exercise, maintain a happy mood, to promote the fetal brain function The fetus should maintain a good nutritional status, can exercise moderately every day and maintain a happy mood to promote the perfection of fetal brain function.