When our first was born, I was determined to eliminate any possible source of noise inside (and outside) the house in hopes of bettering my baby's sleep. I neurotically tiptoed around, turned off the phones, waited on chores that made noise, and considered complaining to the County for allowing leaf-blowers in my neighborhood. Guess what? Nothing worked. The baby slept as she was going to sleep (not very well) no matter what. As I kept having babies, the ability to even try to maintain a quiet home was beaten out of me. It simply wasn't possible. And guess what? The babies still slept as they were going to sleep (still, mostly not very well). But slowly, it dawned on me that the normal, medium-noise level of the house not only didn't seem to worsen the baby's sleep...it improved it. Turns out, babies are used to a ton of noise in-utero. The mother's body -- and the typical household -- make it fairly raucous in there. So don't worry about a little noise -- in fact, noise machines, fans, and radios turned down low have all been found to encourage a good snooze.
I have found that a sudden CHANGE in the noise level of the house can disturb sleep; for instance, a generally noisy house turned quiet all of a sudden is just as likely to wake the baby as is the big roar of the garbage truck outside her window. But all in all, the baby will get used to the noise level in your house, and eventually allow you to sleep (a bit) too. So don't make yourself nuts trying to shush the other kids (and your entire neighborhood). Just breathe deeply, and try to grab a nap!
Dr. Heather The BabyShrink