ds is 6 months and rather dummy-dependent so today I thought I'd try to see if he could nap without it. I've never liked it, but he's been hooked since a hospital stay at 6 weeks. 3 minutes of snuffles then... silence! I popped my head over the cot to see and he had his thumb in his mouth sleeping soundly. Oh well. He has won. Have others found this happens, that sucky babies will suck whatever.