That is the advantage of a parents who are in the education fields.
My Wis cousin n his wife are both educators. He's a director at the u of Green Bay and she's a grade school teacher. They taught their daughter at infantry who can't even talk yet but was able to identify animals and sounds. So that one summer when I went to visit, I babysat his daughter at Walmart to kill time while they go close a housing deal. At this moment, I do not know their daughter at all. I picked up a farm book and flipped the pages and as soon an animal she sees, I points my finger at it and she gave me a sounds. Duck goes quack, cow goes moo.
Letting your kids to learn two grade in advance is key. I was more of the next chapter kind of a guy and even with that, my teacher thought I was gifted smart. Really dumb as a rock though.