During pregnancy, diet plays a vital role in the development of the fetus. A reasonable dietary mix can provide sufficient nutrients and promote the healthy development of the fetus. This article will introduce some dietary principles that should be paid attention to during pregnancy and foods that are beneficial to fetal development. First of all, the diet during pregnancy should be balanced and varied, including the five major nutrients: carbohydrates, proteins, fats, vitamins and minerals. Carbohydrates are the main source of energy for the body. Pregnant women should consume an appropriate amount of rice, noodles, bread and other grain foods every day. Protein is the main building block of new cells and tissues. Pregnant women can choose protein-rich foods such as fish, poultry, and beans. Fat is an important energy reserve and carrier of vitamins, but choose healthy fat sources such as olive oil, fish oil, etc. Vitamins and minerals are particularly important for fetal development. Pregnant women should eat more foods rich in vitamins and minerals such as fresh vegetables, fruits and dairy products. Secondly, you should avoid eating some foods that are not conducive to fetal development during pregnancy. For example, raw foods such as sashimi, raw meat, and raw eggs may carry bacteria and parasites, posing potential threats to the fetus. In addition, caffeine and alcohol should be avoided as much as possible because they may have adverse effects on the fetal nervous system development. In addition, pregnant women should also pay attention to avoid eating too much salt and sugar to avoid causing edema and blood sugar fluctuations. Then, there are some foods during pregnancy that are particularly beneficial to the developing fetus. For example, foods rich in folic acid are very important for the development of the fetal neural tube. Pregnant women can eat more green leafy vegetables, beans and whole grain foods. In addition, iron-rich foods such as red meat, egg yolks, and beans can prevent anemia in pregnant women. Calcium is also very important for the bone development of the fetus. Pregnant women can consume more dairy products, beans and seafood. In addition, fish rich in omega-3 fatty acids are beneficial to the brain and eye development of the fetus. Pregnant women can eat salmon, sardines, etc. in moderation. Finally, you also need to pay attention to food safety during pregnancy. Pregnant women should choose fresh, clean ingredients and cook them thoroughly to avoid bacteria and parasites in the food. In addition, try to avoid processed foods with too many additives and preservatives, as well as foods with colorings and flavors that may have adverse effects on the fetus. In conclusion, diet during pregnancy is crucial to the development of the fetus. Pregnant women should maintain a balanced and varied diet, avoid foods that are detrimental to fetal development, and increase their intake of nutrient-rich foods. Reasonable diet and food selection can provide a good development environment for the fetus and promote its healthy growth.