The newborn’s stomach is horizontal, and the activity of digestive enzymes is low, poor digestive function, gastric smooth muscle development is not yet perfect, after filling with liquid food, it is easy to dilate, high activity, which will lead to the symptoms of spitting up; infants and young children, intestinal mucosa, poor muscularis propria development, the mesentery is soft and long, prone to intestinal torsion or intestinal intussusception, the intestinal wall is thin, permeability is high, the barrier function is poor, the digestion of the food is not perfect and allergic materials are easy to go through the intestinal mucosa mold and enter into the body, thus causing nausea and vomiting. Enter the body, thus inducing allergic reactions, resulting in children with nausea, vomiting, diarrhea, abdominal distension, especially egg-shaped watery stools are dominant. Especially cesarean section children, intestinal flora is not established, especially the lack of bifidobacteria, it is easy to induce the symptoms of indigestion, want to improve the need to start from the following aspects: 1, adhere to breastfeeding: breast milk is rich in lactoferrin, as well as a variety of digestive enzymes, which is conducive to the baby’s gastrointestinal tract, digestion and absorption. 2, the first three months of the baby on-demand feeding: according to the child’s work and rest time feeding, breast milk in the gastrointestinal tract metabolism time 2 to 3 hours, milk powder in the gastrointestinal tract metabolism time 3 to 4 hours, according to this point in time, control of the child’s diet, especially for the less easy to have a sense of satiety baby. 3, on time to add complementary foods: around 6 months of age to start adding complementary foods, from the high iron containing rice flour to start adding, do not give the child too early to add complementary foods, even if the breast milk is not enough, we should choose a more suitable for the child’s formula milk to give supplementation.