How loud should white noise be played? Should it be turned off once baby is asleep or keep it going? I'm worried the little one is going to become too dependent on it.
White noise wants to be similar to the volume of a shower. Once he is asleep, you will keep it on as the body can habituate to white noise but not to music.
Please do not worry about him becoming dependent on it as white noise is an excellent sleep aid. Even for adults! As it blocks out all sorts of external sounds that disturb sleep, e.g. loud cars, planes and dogs barking.