My DS is 2.1 and can't seem to tell the difference between all the main colours - everything is red! he's got a good vocab and his speech is coming along really well so it's not that he can't say the words out loud, so i just wondered when he'll be able to start naming colours.
He's pretty sharp on most things, doesn't miss a trick really, so it seems kind of weird he can't tell the difference between say, a red cup and a yellow banana!