When a 3-year-old baby has a fever of 37.5 degrees, as long as the child’s mental state is relatively good and there is no mental depression, you can first not deal with it, just give the child more water, more rest, and eat more fruits and vegetables rich in vitamin C, which can help strengthen the baby’s resistance and promote the self-healing of the disease. If your child is feeling uncomfortable, you can give him/her a Chinese medicine to reduce fever, such as pediatric black beetle and fever granules or pediatric antelope granules. You should also monitor your child’s body temperature and not allow it to exceed 38.5 degrees. If the temperature continues to rise, you can add physical cooling methods to your baby, such as wiping the skin with warm water, especially in the armpits, groin and neck where large blood vessels are abundant.