Geez, really? Then I guess I'll have three alcoholics or drug users on my hands one day! Mine all love/d dummies

I'm unable to help you with any research sorry. My DS2 and DD both have muslin "blankies" they cuddle up to in bed. I have found this wonderful when they have to sleep elsewhere (in the car, on holiday's, etc) because it feels familiar and helps them feel secure. I can't see the harm in it, but I haven't read any research about it either. I grew up with a blankie (I still own it, it's in storage though now LOL) and I am not an alcoholic or drug user .

I guess if your bub has come this far without needing a comforter, then there's no point introducing one now?