If the role is mostly playing with the kids, reading, or general supervision, it would typically fall under non-clinical volunteering. If you’re more directly involved in their care, helping with feeding, mobility, hygiene, or assisting alongside nurses/therapists during care routines, that’s what usually makes it clinical.
If you have some flexibility, just make sure you understand what your actual day-to-day responsibilities will be before labeling it. Either way, both clinical and non-clinical service in that kind of setting tend to be viewed positively.