Anyone can speak with babies if you just wait long enough. I guess they won't be babies anymore, but whatever.

Ummm. I can already do both: I assume the author means be able to understand and be understood by ___.

I guess it should have bee able to speak WITH instead of TO

Well, I can speak to both of them. And I'm relatively certain neither especially understand. But babies don't eat people, and bears do. End of argument.