My son is three, he has always been ahead in everything. But he just won't get colors! i'm starting to wonder if hes color blind! He dosnt know even one color. We practice daily. ive tried teaching him multiple colors, but when he wasnt catching on i narrowed it down to one color. For the past two weeks we've been practicing Red. Just red. With valentines day i figured it would be easy. But still he dosent know. Any one have any tips to help us?