Even that won’t do it. Kids show up to kindergarten with wildly different abilities to even “take turns” and participate conversationally. Kids who had less adult conversational interaction as toddlers won’t get the same out of school even with the teachers being in rotation.
There’s disagreement as to whether the gap is 30 million words, but it seems quite likely to be well into the millions. https://www.edutopia.org/article/new-research-ignites-debate...
It’s hard.