It has been shown that the input that small children receive is much much larger than originally thought by the proponents of that theory. How parents stress certain words, how they make small pauses, how they look and point at things when talking, how they repeat a sentence correctly with emphasis when the child said it wrongly (Child: "apple green". Parent: "Oh, you want the GREEN APPLE? Here you are."). Wasn't there even a guy who said "How can children learn languages without pre-determined laws? Wouldn't that require being constantly corrected by their parents?". Well, see my example with the apple.

Anyway, this discussion is going nowhere. Notify me if there is other evidence apart from "I cannot imagine how the human brain can do that". As other people have written in a similar thread some months ago, this is pseudo-science.