First word?

I think we might have heard Katie's first word this morning. She has this (annoying) toy that has a little steering wheel & horn & all sorts of buttons on it that make a lot of noise. One of them says "bye-bye". She was crawling away from the toy earlier today and the button that says "bye-bye" got pushed. Well she turned towards the toy, gave a little wave and said very softly "bye". Mom & I looked at each other and were wondering if it was deliberate. It certainly seemed like it.