Make sure your kid knows what's the normal level of noise around the house.
When you put them for a nap, don't be intentionally way too quiet. Just make normal noises. When it's bedtime, it's OK to watch movies at the normal volume. They'll get used to it.
They'll even get used to it still in utero. Our dog used to bark a bunch and did so while my wife was pregnant. Never fazed the kid even once when they were born. Not even if the dog barked at the doorbell or something literally next to their face.
Other dogs though, that got a response. But us watching movies or the dog barking was stored as "normal noise, no need to worry" in the brain.
When you put them for a nap, don't be intentionally way too quiet. Just make normal noises. When it's bedtime, it's OK to watch movies at the normal volume. They'll get used to it.
They'll even get used to it still in utero. Our dog used to bark a bunch and did so while my wife was pregnant. Never fazed the kid even once when they were born. Not even if the dog barked at the doorbell or something literally next to their face.
Other dogs though, that got a response. But us watching movies or the dog barking was stored as "normal noise, no need to worry" in the brain.