Baby's temperature 🤒🤧

So if you go on Tylenols website, it says that the reading depends on where you check - ie. The bum, the ear, the armpit, or orally.

I checked my daughters temp (her armpit) and it said she was 37.4°C.

The website says a fever (checked at the armpit) is higher than 37.3°C.

She has maintained that temperature for roughly an hour and a half.

I just gave her some tylenol (because I wasn't able to get her from daycare right away)

She is 12 months (one year). Is it a HUGE deal if its plateauing 0.1°C over the fever threshold??

Daycare said she has to be fever free for 24 hours.

I'm new to this. I'm not sure. She has never been sick before. But I knew that once daycare started the germs would catch up to her.