What I read when my kids were young was that MANY kids don't 'get' colors till they are around 3 years old. If you think about it, color is really an abstract idea. So from what I understand color is not something kids get before they get shape & numbers. And while many gifted kids can tell colors apart early, and lots of drill can help it's really not a big deal at 2.
My older daughter needed speech therapy and 2. And I kept getting comments from the therapists that she didn't seem to know her colors. I was perplexed, as I understood that this was normal. It was NOT a problem, sure enough by the time she was 3 she knew most colors and is now a college art student who has more an eye for color than her mom.
