The diet during pregnancy should follow the principle of \”appropriate, balanced, and diverse\”. Maintain a daily diet in the first trimester, focus on protein intake in the second trimester, and eat smaller meals more frequently, diversify the diet, monitor body weight, and supplement unsaturated fatty acids in an appropriate amount in the third trimester. The strategy for growing a fetus without gaining weight: Eat small meals frequently, control the intake of carbohydrates and fruits, increase high-quality protein, and take a walk after meals to ensure that nutrition is given priority to the fetus and achieve healthy weight management during pregnancy.