If your baby has frequent fever indicating low immunity and recurrent infections, you can take your baby to the hospital to check trace elements and vitamins. If the low immunity is caused by the lack of vitamins and trace elements, you can give appropriate supplements. If the laboratory indicators are fine, you can give your child oral medication to improve immunity, such as transfer factor, spleen aminopeptide, and Sophora yellow granules. At the same time, we should pay attention to a balanced diet and avoid partial and picky eating. We should also pay attention to keeping the indoor air circulation and take the baby outdoors for physical exercise frequently, which can increase the resistance and avoid repeated infections.