Covid + & Newborn have Fever

Hi updates both baby and i covid , went to kkh as baby had fever 37.9. From there we are being warded, and stay for 2days. As baby temperature instantly drop to normal within one night. But the doctors there, not helping much. As they always pressure and pester me to take blood & spine test and put antibiotics drips on my baby when he has no more fever. They keep emphasizing on brain/urine infection. Side effect of not doing the test etc. 3 Doctors back to back keep on pressuring and pestering me to do the test. One even said, its better to the test if i dont we dont know the infection and who knows one day i will regret and it will involve death if i dont take the test.