I would like all disabled bathrooms to have a bigger changing units for children with hidden disabilities like autism.

My son is nearly 3 with non verbal autism. For this reason he has no language to communicate if he needs to use the restroom and no understanding of needing the toilet so he cannot be potty trained. Whenever i am out in public i find myself having to change my sons nappy on a bathroom floor as the baby changing units are too small for him and also couldnt take the weight of him. I propose we make disabled bathrooms just that and make them useful for all disabilities hidden or otherwise