IQ is related to genetics, nutritional status and brain use. However, relatively speaking, nutritional status during brain development tends to be of greater importance. If you want your child to be smarter, it is important to pay attention not only to nutrition during infancy and early childhood, but also to mother’s nutrition during pregnancy and breastfeeding. Nutrition starts in the fetal period. A comparative study of the development of the brain of malnourished children and that of normal children found that if the embryo is malnourished, the total number of brain cells can be reduced by 17%; if malnutrition occurs after weaning, the total number of brain cells will also be reduced by 18%, and if malnourishment occurs both before and after birth, the total number of brain cells can be reduced by 40%, and the number and weight of DNA will decrease accordingly. If malnutrition persists, not only the number of cells decreases, but also their size and the amount of lipids in each cell. If the nutritional status from the beginning of pregnancy to the second year of life is OK, and malnutrition occurs later, the DNA and the number of brain cells will be normal, only the shape of the cells will be smaller, and the intelligence will soon return to normal as long as the nutritional status is improved. Sugar is the most important energy source for brain activity. In addition, calcium can inhibit the frequent excitation of brain nerves; vitamin C can play a lubricating role in brain function, and vitamin B has a multifaceted role in protein metabolism in the brain, so that the brain of infants and young children is well developed, and infants and young children, pregnant women, and breastfeeding mothers need to attach great importance to the intake of these nutrients.