Thanks for writing to health care magic.
If he has fever
for the last 2 days he should be given some time to recover.
During the episode of fever his appetite will not be normal and so he must not have consumed enough. He must have lost some calories because of the raised body temperature.
More over there may be malaise
associated with fever.
Swimming requires lot of calories as a exercise.
Even though he may not have any fever I think it is a good idea to stop him from going to the school.
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Hope this helps.
Dr Y V Siva Sankara Murty
Associate Professor of Pediatrics