Probably a stupid question

My Lo is teething and doesn’t want anything to do with frozen stuff yet but loves when I soak a cloth with cold water so he can chew on it, my question is..when he sucks is he taking in too much water? 😐 he does it all day and he’s EBF and I kniw they’re not supposed to have too much water on top of BM. Probably such a dumb question but I don’t want him taking in too much extra lol

Edited to add: he’s 4.5 months old!