I agree with Kai, I think. But I think it can be a gray area.

Let me emphasize that we KNOW that part of why upper-middle class children of educated parents succeed in school is because their parents have been talking to them about letters, phonics, math, etc since babyhood. I don't think there is any call to get hysterical about worrying that this is a bad idea. It is helpful to children, and more parents should be doing it. We just don't want to get totally out of control with it and push it so much that kids don't also play outside, do art, get muddy, have pretend tea parties, etc. In fact, I don't think many parents really create a hyperactive hothousey environment. It's too much work! I think the real concern is excess screentime, which may or may not be "educational."