I just put our son JD down to bed, and turned on the stuffed lamb that makes various sounds - I chose the rain sound, that seems to soothe him the best. When he was younger (3 mos.) we always used some form of white noise to help him sleep - quite ironic as you would think that silence would be best.
Yet as many moms attest, some kind of constant background noise provides comfort, and in some ways simulate the sounds of the womb. We also use it because it buffers any other sudden noises around the house, e.g. clanging of dishes, door closing, and even typing in a room next door.
So what kind of white noise do you use for your baby?
8 months ago