Control sugar and snacks. Children’s immune system is weak and vulnerable to damage from various additives, preservatives and sugars in food. Therefore, parents should give their children less snacks containing preservatives and additives, and control the amount of sugar intake. Rectify the intestinal tract. The presence of probiotics in the human intestine can promote digestion, eliminate toxins and help boost immunity. Parents can usually give their children more yogurt in moderation to supplement the intestinal probiotics. Reduce anxiety and stress. Stress in children’s lives and studies can cause a rise in cortisol and adrenaline secretion, leading to a lower immune system response. Therefore, parents should pay attention to give their children time for rest and recreation, and do not give them too much pressure. Get enough sleep. Children need 10 to 14 hours of sleep a day and need to be in a dark environment without night lights in order to ensure melatonin secretion so that they get enough rest to strengthen their immune system. Studies have proven that electromagnetic frequencies can affect sleep quality, so parents should try not to place electronic devices in children’s rooms or unplug them before bedtime. Take vitamin D and zinc supplements. Studies have shown that vitamin D and zinc can help strengthen immunity, parents can give their children more food rich in vitamin D and zinc, such as fish, nuts, seaweed, etc. In addition, 90% of the body’s vitamin D is synthesized in the sun, so when the sun is out in winter, it is best to take children outside in the sun, which helps synthesize vitamin D.