It’s not the temp that matters but the overall comfort of the child! If he’s still feeding alright and is active then no need to feed fever syrup. We do give once before our child sleeps though so he can sleep more comfortably.
I gave at 37.5/37.6 because my mom told me once you let it hit 38 hard to go down. I fed my LO at 37.5, went up to 37.8 and never went up anymore. I only fed once and spam fever patches.
if your child is still so young, I'll suggest bringing your child to the pd first