Wow thank you all so much for your replies!! Sooooo helpful..

Daniellabella - so your DD didn't get turned off breastmilk after having formula a few times?? I hear stories and it worries me!!
No she didn't at all. After she first got babysat, I decided to try 1 bottle a day so she was used to bottles which made it easier for being babysat. Then I got slack and didn't give her bottles for several weeks which made it really hard when I went back to work and she started daycare. Her first day of daycare she refused to take the bottle which is when I decided I had to do 50/50 for a while however after a short time that wound up in stopping breastfeeding.