As mentioned below, I'm wondering if Reese is colorblind. Griff could recognize and name lots of colors around age 2-2.5, but Reese is still not there. He can label blue, black, and pink pretty easily. Often green. Yellow, rather spotty success. He calls things "orange" a lot. Red? Almost never. And it's the red that makes me wonder. What is he seeing? Is color recognition just not what his brain wants to work on right now, or is he actually colorblind?
My dad is red-green colorblind. I believe his decreased color sensitivity would be described as protanomaly (red-weakness), judging from what I know of the things that challenge him - things like differentiating a red flower in a green bush, or being able to accurately label the colors of electrical wires. I *think* red appears green to him. Red-green deficiencies are sex-linked - carried on the X chromosome. This makes my sister and myself carriers of a color-defective X chromosome, which means all of our sons have a roughly 50/50 chance of being colorblind.
I've never had any doubt that Griff got my "good" X, but it's looking like Reese may have been given the other one. I'm going to show him some images from a pediatric colorblindness test in the next few days and see if he points out the shapes or not.
I wouldn't say this is a huge concern or that there's anything we would (or could) *do* once we find out, but it would be helpful for us to know this about Reese, and for his teachers know in the future. We'll need to help him to find strategies to deal with some situations, like memorizing the positions of red and green traffic lights instead of relying on color. (Hmmm, and that's another thing, by this age Griff was able to tell me to stop or go by observing a traffic light - again, different kid/interests, or difference in vision?) I wonder if colorblindness is reason for an IEP these days?