I managed to make it close to a month before giving a dummy with my first. But this one is 3 weeks and I broke down earlier in the week and got her one. It doesn't really effect bfing as far as nipple confusion since they aren't getting food from it. it's not like a bottle. The only risk you run is that you need to make sure you milk supply is up and you are clear about when baby is hungry and when they are just wanting to suckle (if you give a dummy before your milk supply is up they are obviously nursing less and then your body will make less milk). You have to keep in mind that the first few weeks baby may need to eat every 1-2 hours, so if you are thinking of doing it to extend time between feeds, just make sure baby is getting enough by counting those wet nappies.