I used playtex. I liked the ones with the liner. It may depend on your baby so I wouldn't stock up on any brand just yet. We bought every brand and finally my son took playtex after months of starving while I was working. He never really liked bottles but managed to survive by taking minimal amounts from the bottle and then breastfeeding all night long after I worked. Not to scare you, but some breastfeeding babies are picky, mine was a severe case!
I loved the shape of the Avent bottles loved them at first. I then had a big problem with them leaking all the time no matter what I did, they leaked. Was very bummed so switched to playtex and everything was great.
I stocked up on Avent before my son was born, since I had the Avent pump. They are super nice, but it really isn't up to mom as I found out. My son took it twice (I didn't give him a bottle often) and then wouldn't drink from it anymore. For about 3 months I had to switch to the Playtex drop-in style - with the large latex nipple. I still used the Avent bottle to pump into, so I knew how much I got, then poured it into the Gerber freezer storage bags (which could also be used as bottle inserts). Eventually we switched back to Avent when he was older. I would try the Avent first, but keep in mind you might have search for what your kid likes. (I had a friend who's baby wouldn't take regular bottle tops until about 9 months - only the kid they give at the hospital. And he would only use newborn size pacifiers until after 12 months).
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