I used the Playtex bottles with drop in liners with both of my kids and will most likely be using those again this time as a companion to breast feeding. Because of the nipple design they seemed to not have any major problems switching back and forth between breast and bottle. The kids seemed to get less air with them also and were therefore less gassy and less fussy. They were also easier to clean because the liner just gets tossed out so only the nipples and rings really had to be sterilized regularly.
I've used Dr. Brown with my two kids and will do so with #3. I nursed my two kids and they were able to go between the bottle and me with no problem. There are lots of parts to the Dr. Brown bottles which suck to clean, but my kids did just fine with them.
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