I’m working with special need kids, ages from 1 to 12 years. During my sessions, at times I’m required to take them to the toilet. As they are mentally or physically disabled, so I need to assist them in the toilet. I was wondering if my wudhu breaks when I’m assisting a kid 5 years plus in the toilet

No. But for kids with such age, you are not allowed to look at or touch their private parts