I start peds this summer and i have full sleeves. There are always people who dislike tattoos, but the kids love them and the parents are generally of the accepting age compared to IM. I usually wear long sleeves or compression sleeves and when I wear them, many people see them and say "you have arm tattoos, don't you? that's awesome." In all of 4th year which was entirely peds (except one or two rotations), I haven't had a single problem. Every kid I have ever interacted that saw my tattoos is enamored by them and super excited. Mine are very colorful though.