Awww, they're so cute and definitely only a couple days old. I wouldn't star tgiving them treats until they're at least a week and then only just yogurt with a little applesauce. I don't know about grapes. There's a link/pages somewhere on here that lists all the food that you can give a chicken. Unfortunately, I can never find what I'm looking for when I'm looking for it. I'll post a link if I can find it.
I found the chick treat post, thanks! And I'll tell my kids that the chicks are two days old and their birthday is March 1. That kind of stuff is important to them. I'm sure I'll have a ton more questions as the days progress!