Laurin, I use a dummy with Nina. Have since day one. She's never had any confusion and it's great. She is always looking for something to suck on. The only time I don't use it is when she's in bed. I don't want her to lose it in her sleep then cry for it! We just went grocery shopping and I had her sitting in the carrier and I didn't take the dummy, and the whole time she nawed away on my finger!
Oh Charli - I'm just at the end of that 6 week growth spurt, that was the worse one yet!!