There are many factors that affect fetal intelligence, including hereditary diseases, drugs, nutritional status, adverse natural environment, etc. 1, hereditary diseases: such as marriage of close relatives or hereditary diseases of either spouse will affect the normal development of fetal intelligence and development; 2, the impact of diseases or drugs: such as viral infectious diseases or inappropriate use of drugs during pregnancy may affect the development of fetal brain cells; 3. Natural environment: such as water pollution (heavy metal mercury, lead, etc.), air pollution (car exhaust, lack of oxygen, smoking, etc.), radiation pollution (X-rays, microwave, etc.), water quality lack of iodine, etc., can lead to fetal mental development disorders; 4. nutritional status: the establishment of brain development and function is closely related to nutrition, especially insufficient or lack of protein and folic acid supplementation can affect the formation of brain cells. Pregnant women must maintain good habits, live a regular life, stay up as little as possible, and have a balanced diet. You should also pay great attention to the psychological adjustment, do more things that make you happy and keep your body and mind happy.