I wish my nephew would let me paint his nails, but he's in that stage where he's terrified of anything feminine.

If I had kids, I think I'd go ahead and let them use my nail polish. I remember little kids' nail polish being gummy and hard to use (maybe I just had a crappy kind), and I always felt really special using my mom's.

My daughter has some kids type of her own. I also have bought her some "big girl" polish that I like that we share. She also is allowed to use mine. My daughter is 9 so I try to treat her a little more grown up.

I think the polish is all bascially the same.. I don't have kids, but when I was a kid I just used regular nail polish. I remember waiting forever for halloween to buy the black polish...

I don't have kids, but I certainly know my nail polish. Today's nail polish is a lot less toxic than the polish of previous decades. Most major brands now are "3-free", meaning they don't contain formaldehyde, toluene, or dibutyl pthalatate. They should be okay for any kid that is old enough to understand that nail polish shouldn't be eaten. If you're still concerned, there are a few brands of water-based nail polish. Some peel off (which is fun for kids), so no worries about the little ones needing to use remover.