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When my daughter was born I needed to express some milk so needed to get some bottles pdq. Having used the ones with the Tommy Tippee steriliser, we were recommended Dr Brown. About the time I bought Dr Brown (v pricey) there was a big news story about BPA in bottles and how bad this was for babies (or some other scare story) and being a paranoid new mum I was told about these so I immediately bought some!
At the time of buying (March 09) I think these were the only BPA free bottles on the market, now I think most brands have brought out BPA-less bottles. These bottles also have a valve to stop the milk coming too quickly (I think that's what it's for - my mum once made a bottle without it and the teat collapsed with all the sucking!) I think it may be designed to aid colic.
These were only available mail order last year but they do stock them in Toys R Us now. They aren't cheap (2 x 9oz bottles are £13.99) but are relatively sturdy. Each bottle comprises a plastic bottle, which is slightly yellowy, a 2 part valve (one soft plastic, one rigid) a non spill cap, a collar, a teat and a lid, I have broken a few collars through over tightening as the bottles did leak when shaken in the past. However I emailed Born Free and they sent me some more collars free of charge.
There are small 5 oz bottles, which I got to start with and then 9oz which will last a long time. You can also get teats 1, 2, 3 and variflow (although I couldn't get on with variflow and had a screamy baby with it). They do make other products but I've found the price quite prohibitive to really investigate. The bottles all fit in my Tommy Tippee microwave steriliser so no problems there.
These bottles serve a purpose and I'm not going to change now, but for future babies I would probably buy a more readily availbe brand that was BPA free, both for cost issues and ease to get spares.