The Difference an "S" Makes

Lately Benjamin has started adding an "S" to the end of all his words. I think this is because we started talking to him more about what is Mom's and what is Dad's and Benjamin's and Daniel's. I really don't know how it happened but he add this "S" to everything. Some examples-

Cars
Babas (banana)
Balls
Das (Daniel)
CooCoos (cookie)

It's really not that big of an issue except in one situation. We've taught Benjamin the sign language for All Done and he used to do the sign and say "Aaa" (the same A sound as in cat or bat. You know where this is going! Imagine now a little kid saying "Aaas" all day long.

Yup, we laugh every time.