There can be a few reasons why you want to or need to soundproof your baby’s nursery.  On the baby’s side, if the room is not quiete enough, your baby is not going to have proper sleep.  Noise can be due to noise birds, barking dogs, or busy roads. It doesn’t matter what is coursing the noise but the noise itself is interrupting your baby’s sleep.  It can course short naps during the day, frequent wake-ups at night, and early wake-ups in the morning.
Sometimes you need to soundproof your baby’s nursery due to your baby’s crying and it’s disturbing your neighbors.  It’s especially a problem when you’re living in a multi-unit apartment.  It can be very stressful for parents (especially first-time parents) when their baby is crying a lot and they don’t know how to control the crying.  The more anxious the parent gets, the more the baby cries.
There are quite a lot of things that can be done to soundproof or reduce the noise in your baby’s nursery.  Here are some ideas that might help:

• Fill up the room:  The emptier the room is, the more sound will echo and travel.  If the nursery is somewhat bare, now is the time to get some “stuff” between the baby and the walls. Bring in more furniture such as a dresser, display shelves, bookshelf, or a rocking chair.
• Move the cot:  If the cot is standing next to a shared wall, move it to an interior wall.
• Décor  (for the shared wall):  Hanging large pieces of canvas artwork, fabric paintings and even decorative quilts will muffle the noise.  You can also hang heavy curtains on the windows.  The curtains will help empty space, it will help muffle outdoor noise and it will block out light to make the room dark.

• Cover the floor:  If you have bare floors, get a BIG rug that covers most of the floor.  Wool is a better sound baffle than cotton, and a tufted rug is better than a flat-woven one for sound containment.
• White noise or Noise machines:  White noise (fan/humidifier/ white noise cd’s) or Noise machines can be relaxing and calming to your baby, but it also helps mask outside noises that may be irritating to your baby.
• Soundproof Windows (Double Glazing):  This is a more permanent change but it will make a huge difference.  You don’t need to replace your existing windows, they basically add on a window to create a double glazing effect.
• Acoustic Sound Blankets:  Acoustic Sound Blankets absorb and reduce the noise to an unnoticeable level for a quiet environment. These Sound Blankets can be hung in front of windows and doors to block out noise.
• Soundproofing panels/tiles:  This is also more of a permanent fixture but definitely worth doing.