My son is 4 and autistic, we also have a toddler in the house. They both use 360 cups. I know we're supposed to be teaching them to use open cups at this age and he can do it although he prefers his 360 cup. But practicality wise non spill cups around the house are so much better and safer as the little one will grab the older one's cups. Am I a bad parent for letting my 4 year old continue to use baby cups? Are there any better non spill cups people would recommend for a 4 year old?