They are both right with the no shhhh deal. When I was pregnant with my son, I was a travel agent, worked until the day I went into labor and he was used to noise, so if we tried to stay quiet, he would freak it. This being a newborn that could stand laying in his bouncy chair and me vacuuming, never even blinked an eye.
I decided since when I was pregnant with my daughter (last year) the opposite happened, so we got her used to noise real quick - just to be on the safe side.

And she is going on 9 months now, and still sleeps 10 hours a night!