The development of the small intestine in school-age children is characterized by its long length, susceptibility to intestinal torsion and intussusception, thin intestinal wall, and frequent occurrence of gastro-colonic reflex.
Children’s intestinal tube for the length of 5-7 times, the main functions of the small intestine is movement, digestion, absorption, immunity. Preschool children intestinal mucosa muscle layer development is poor, the ascending colon and the posterior wall is poorly fixed prone to intestinal torsion and intussusception. Thin intestinal wall, poor barrier function leads to intestinal toxins easily cause systemic infections and allergic diseases, the cerebral cortex is not well developed to occur gastro-colonic reflex caused by the urge to poop.
The developmental characteristics of the small intestine of preschool children determine that they are more prone to illness than adolescents and have lower resistance, so preschool children should pay more attention to diet and hygiene, pay attention to nutrition.