Reminds me of some of the parenting books I've been reading since we had our first child. The advice is generally not to try to teach your children to read ahead of when they do it in school. The reason being that you will probably achieve at best mediocre results at the expense of completely ruining the novelty of it for your child, guaranteeing that when time does come to learn and they are fully developmentally receptive, they will be far less interested than otherwise. Studies have shown that there is (on average) no developmental benefit from early reading and a mild possibility of negative impact.