Children often catch colds due to poor immunity. To improve this situation, it is necessary to enhance their physique. Along with increasing outdoor physical exercises, it is also crucial to ensure sufficient sleep to support normal physical development and boost metabolism. Nutritionally, it's important to maintain a balanced diet, ensuring the intake of high-quality proteins like fish, shrimp, eggs, and milk weekly, and consuming plenty of vegetables and fruits. Additionally, supplementing with trace elements such as calcium, iron, and zinc may be appropriate. In severe cases, oral medications to boost immunity can be taken, but this is not a permanent solution.