I heard of lots of transitional, or combo bottles when you want to pump milk into them... So far i have purchased the medela, calma, which is supposed to act like the breast and release milk only when baby sucks... I purchased tommy tippe, which is supposed to be close to the breast, and the munchkin latch bottles... Thats a new bottle thats supposed to mimick breast... I havent tried any of them yet, but I really want this baby to learn to take bottle and breast. With my last baby, she refused the bottle. I wasted lots of pumped milk because she would not eat and wait till I got back. It was difficult. Hopefully someone has a good bottle they used that can offer a good experience.