“Why is that baby crying?”

My 4 yr old son likes to point out when other kids and babies (aka anyone smaller than him) are having a hard time. I think he recognizes his own feelings and wants to understand when it happens to another kid. On one hand, this is cool because he is generalizing emotions (he is autistic). On the other, it can be really rude to the other family. I am positive that if my son was having a tantrum in a public place, I’d be annoyed to see a slightly bigger kid asking “why is that baby crying like that?”What is a good way to acknowledge his question in a teachable way without being rude to the other family? Thanks. via /r/Parenting https://ift.tt/2IJgYgj