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Glass. It's expensive and fragile, but good old silicon oxide is as inert as you can ask for. Extra estrogen in a female baby is absolutely a concern. I was p

Glass. It's expensive and fragile, but good old silicon oxide is as inert as you can ask for. Extra estrogen in a female baby is absolutely a concern. I was part of an investigation that dosed nursing rats with BPA and investigated the effect on female offspring. I left for graduate school in polymer chemistry, but you can read the results here: http://pubs.acs.org/doi/abs/10.1021/pr401027q http://pubs.acs.org/doi/abs/10.1021/pr401027q It's no blockbuster paper, but the whole of the evidence gathered suggests you shouldn't expose your baby to BPA just because it's female. There's also a link between post-menopausal hormone replacement therapy (older women taking estrogen after their body ceases production) and breast/uterine cancer.

chockablock 12y ago
Glass is not that fragile. We've been using tempered glass bottles (the fancy lifefactory ones with a silicone sleeve) for more than a year and have yet to break one despite many drops onto floor, pavement, etc. Cost is a little higher than plastic, but absolutely down in the noise when looking at total costs of having a kid. I think we spent ~$150 on bottles, nipples, and tops; Including lids for these bottles to covert them into a sippy cup. There are cheaper tempered glass options available. Glass also doesn't age like plastic--our stuff has many more years of useful life in it.