PS, about "Teach Your Baby to Read"
I tried that with one of the kids, too, and likewise there was no interest, so I dropped it.
Later on, at a pre-kindergarten screening, it was discovered that the child had rather severe astigmatism, of which there had been no previous behavioral indication. Got glasses, started learning to read right away.
I never would have thought a visit to the opthamologist was in order. Have you given that any consideration?