A few of my favorite Cambria phrases

Here are a two of my favorite Cambria's words in use:
"I suppose we should stay out of my baby's room while she's napping."
"I'm guessing that the sun will not come out today."

Where do kids learn to use words like suppose or guess? Have Jeff or I been using them a lot and she's picked them up from us, or was it some other place? I don't know, but it sure is cute.