A mum friend said this to me when my baby was little, and it worried me at the time. Now she's telling it to our other friends with small babies. I want to step in and say "No, a dummy is an artificial nipple. A synthetic, plastic comforter and it's perfectly natural for a baby to look to its mum for comfort as well as nutrition."
I'm not saying 'Your baby is treating that dummy like your breast!' each time, but I still don't know how she'd take it.
Would IBU to try to contradict her to our friends?