I was in no hurry to wean Jacob off ours, but I didn't want to use it unnecessarily, so whenever the batteries ran out of our machine I'd try him for a day without it. If he was harder to settle, I'd pop new batteries in it. The other month (when he was about 13 months or so?) he just didn't seem to notice, so I never put new batteries in it
Oh, and ETA for anyone thinking about buying something that makes white noise... don't do what I did and get a battery-powered thing! Buy a cheap CD player instead. Much more sensible!!!
Edited by Hopes