Honestly for me, if baby has high fever, go to kkh straight. To rule out anything. My baby had covid and high fever 38 and above and was hospitalized for 3 days. They took urine and blood test to rule out any infection. As theyre still small, they did not give any medication for my baby as they say their kidney is not fully developed. I would suggest to not self medicate baby. Atleast go to clinic. And yup during the 3 days stay his fever go up down