R.C.
Hi there,
I thought the Adiri Nurser was brilliant, and it is but ONLY in theory. It leaks terribly from the top and the bottom unless it is completely, 100% dry and wiill even leak when totally dry. Plus, always having to have a compeletly dry bottle (every single piece) is so unrealistic unless you buy a dozen or so. I returned the Adiris I bought after a week or so of absolute frustration and the girl at Babies-r-us said that several moms are returning them for the exact same reason.
Born Free bottles have a wide base and soft nipples that our baby, as a newborn, took easily to. She also had no problems with the Evenflo BPA free bottles, which are a steal at $2.99 for a 3 pack. They have a smaller base but the bottles fit right on to my pump so I don't have to transfer bottles. Very convenient.
Hope this helps and good luck!