I've never used white noise with my son and he's now 9 months old. Recently he's brought himself out of his routine and he's waking up a lot throughout the night, maybe due to a sleep regression. I know that some adults actually use white noise themselves to help them sleep but at 9 almost ten months is it too late to start using white noise to settle him? As I know it's supposed to resemble what they hear in the womb and calm them but obviously that was probably too long ago now for him to remember.