If a child has a low-grade fever caused by a viral infection, such as a cold, and there are no other complications, the self-healing time may last about three to seven days, but some diseases caused by a low-grade fever can not be self-healing, and you need to consult a doctor in a timely manner. Low fever generally refers to the temperature between 37.3 ℃ and 38 ℃, most of the low fever may be related to viral infections, if it is just a common cold, not accompanied by other obvious discomfort, good resistance, generally may be in about three days to seven days can be self-healing, but there are individual differences. It is important to note that if the low fever is caused by tuberculosis, rheumatic fever and other diseases, it is difficult to self-cure, you need to consult a doctor in a timely manner to clarify the cause of the disease, targeted treatment, such as anti-tuberculosis treatment. Children with a low fever are recommended to consult a doctor in time, improve the examination, and actively deal with or treat. You can’t blindly wait for it to heal itself.