Is this normal?

It is extremely common, since all the kids don’t wear masks and share toys, plus they may not wash hands frequently. My daughter use to fall sick a lot too, until they started wearing masks in Nursery and washing hands. She did not fall sick in school the entire year last year.

my baby has this issue when she is around 12 month fever go and come rashes etc after 13 months plus she is fine again. I think it's due to my baby teething. for yours I'm not sure is it the same

ur child immunity is low . he is expose to to a new environment it's quite common . take some time to boost up back .. same goes for my girls

Might be because of change of environment. Usually it’ll go away with time

maybe can consider non air con environment ifc.