By now, the concerns about bisphenol-A in baby bottles have been well-documented. Studies have shown it disrupts the endocrine system, can cause damage to egg cells and even cause hyperactivity. Attempts to ban it in some US states have mostly failed, but worried parents are starting to seek out options.
Most clear, rigid baby bottles contain it –it's BPA that makes them that way, and yes, that's just about every widely available bottle out there. There are BPA-free options, although they are generally quite expensive, around $10 for just one bottle. Of course, there's always good old-fashioned glass (which is less expensive but gives a klutz like me anxiety attacks, but it's apparently tempered safety glass and thus sturdier).
Once you have decided to use a BPA-free bottle, though, there is more to worry about. Like, what sort of nipple should you be attaching to that bottle? According to Green Daily, silicone, which is nonreactive, is a healthier and greener choice than latex.
The same goes for pacifiers, of course.
Even if you exclusively breasfeed, you're likely going to need to give your baby a bottle of pumped milk at some point. So educating yourself on the options is a good idea.
They also have a Green Baby guide on the site, which lists earth-friendly products that are good for bottlefeeding and good for nursing.