I plan on nursing my baby until I go back to work than she will start needing to use bottles I want to use avant bottles which I have a few of the 8oz ones but someone gave me like 10 5oz medela bottles at my baby shower so i was thinking about just using those until she starts eating more but is it bad to use 2 different brand bottles for your baby? I should also add the medela bottles ate the brest milk storage ones so I was gonna go buy the nipples for them would it just be better to stick with all avant bottles