Why are people upvoting you is beyond my comprehension.
The fact that you were kids and made a mistake doesn’t mean that you can’t/shouldn’t bathe a kitten!!!
Just make sure you prepare for the task: use warm water and wash the kitten from tail to neck - it’s better to avoid the head and anyway there’s little to no fleas on the head. I’m no vet, but I got this advice from my vet when I found a flea infested kitten under my car.
So, for people reding this: yes, you can bathe your kitten, but get some advice from your vet beforehand!