Girls, please help: the child has had a temperature of 37.6 for over a…

Girls, please help: the child has had a temperature of 37.6 for over a month. I also had COVID after that. After that, he started having such a high temperature. A test was taken from the baby too and it was negative. I have been giving blood tests, the result is bad in the body there is inflammation, what should I do? The doctor doesn't prescribe any medication, says everything is normal with you.