Small children with poor resistance can improve immunity through balanced nutrition, ensure adequate sleep, and adhere to sports and exercise. 1. Balanced nutrition: small children are prone to partiality, unbalanced nutrition will cause the lungs and digestive tract mucous membrane thinning, antibody reduction, resulting in small children poor resistance. Parents usually need to give children more food rich in protein and vitamins, such as fish and shrimp, eggs, a variety of soy products, dairy products, as well as vegetables and fruits, etc., to ensure balanced nutrition to help improve the immunity of children. 2. Ensure adequate sleep: parents should do a good job of guidance and supervision, to avoid children stay up late, sleep habits should be regular, early to bed and early to rise. Ensure adequate sleep every day, help to improve the immunity of small children. 3. Adhere to exercise: It is recommended that small children adhere to aerobic exercise every day, such as jumping rope, climbing and swimming, etc., and more sunshine, which will help the body to absorb nutrients and improve immunity. It is recommended that parents who find a small child at home with poor resistance, must pay attention. Promptly take a small child to the doctor, with the help of the doctor, to improve the immunity of small children.