If you have to speedlites and can pair them up to your pocketwizards, I'd use them for ambient lighting setup in whichever room you decide to use.
As it's a freebie use it as an opportunity to learn a little about the session.
As already said tho, try not to point the speedlites directly at the baby tho, bounce them off walls or ceiling or something.
keep
ISO at the lowest setting, and
aperture to whatever looks appropriate.
Shutter speed will fall where it falls, but try to keep it up to a point where you don't induce camera shake.