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[JillyJ]

I agree with the PPs that your BIL was trying to sell you a product, but I couldn't help but cringe a little while reading your post.  A 12 day old baby should not be being exposed to construction dust.  Regular household dust is bad enough, and with the construction there could be all sorts of harmful contaminants in the air.

[CakeEater]

Add me on the list of people who think they could help, not criticize. (But then, I'm the type that (when told of a pregnancy) will offer to come and stay at the baby's house and do the night "walking the floor" duty.
Just because I remember those endless years. (My DS didn't sleep through the night until he was 2 years old and didn't do it every night for another year.)

Will you be my friend?  I have babies like yours.

[Steve]

I would not worry too much about the dust really. Most of it is on the floor, your 12 day old, as you said is not there. If the baby's room is clean and the work is not in progress at the time the baby is there, I doubt there will be a lot of inhaling. Most of the dust will have settled.