I work outside the home full time but was committed to breastfeeding, so pumping became a big part of my life. I needed a pump/storage combination that was quick, easy, and portable. I use the Medela Pump In Style, which in my experience is the most recommended pump and deserves to be. At first, I was pumping into Medela 4oz bottles, but didn't like them for feeding (the nipples always leaked). Then I tried pumping into Medela Pump and Store bags, which was ok - they didn't leak for me - but meant extra expense (buying the bags) and extra work (transferring the milk from the bag into a bottle for feeding). THEN, I tried pumping directly into Playtex VentAire (narrow neck) bottles, which fit onto the Medela pump. Worked ok for a little while, until ALL the VentAire bottles started leaking from the bottom (this isn't a review of those bottles, but let me say that for MANY reasons I would NOT recommend them!).
When I saw this conversion kit, I was beyond excited. And when I received it, and it WORKED, I was just thrilled!!! Avent bottles are easy to clean (no complicated, small pieces) and reliably non-leaking, in my experience. One side note: I always pumped more than 4 oz, but less than 9oz (the only 2 Avent bottle sizes available), so I started using the 7oz Avent Magic Trainer cup. It fits the pump conversion kit and fits any Avent bottle ring/nipple combination. It comes with a sippy cup spout, so you can still use it when your baby is old enough (just be sure to purchase nipples separately if you plan to use the cups for a younger baby).
