Were you more worried about noise from the
bathroom getting into the kitchen, or from
the kitchen to the bathroom? Sometimes it's
better to just have a noisy vent fan in the
bathroom, keeps the women folk from running
the water when they're in there.
As far as the one-year old being disturbed
by the shop noise, I would say do not do any
soundproofing at all. Kids can fall asleep
in quite noisy environments, mine always had
trouble in dead quiet rooms.
I distinctly recall my daughter having colic
when she was less than a year old. No sleep
for weeks.
Finally I got fed up and decided to at least
get some laundry done in the middle of the
night, so I put her in her carseat and took
her down to the shop. I put clothes in the
dryer, and put the carseat on top of that.
While this was going on I though, I might as
well clean up the shop while I can. So I began
puttering away. Half hour later I noticed my
daughter was fast asleep on the dryer. This
became my fallback, I would put her on "air
fluff" in extreme circustances. I also realized
that she would fall asleep almost instantly - if
she was being driven around in my pickup truck.
She's 17 now. She still can't stay awake in
that truck!
Jim