I think nowadays babies are smart. They just pui out pacifiers if they really wan somethg. Only works if bb is in a daze or blur mode when abt to fall asleep. So i guess shld be ok to wean off at some stage. I have alteady used it on my girl since she is 1 mth old. We dont use often though. Only when she is sleepy and cranky, if u see her stoned suddenly out of crying n fussy, juz put it in her mouth. She fall asleep after that. It works for me. 