Bisphenol-A is a synthetic sex hormone that mimics estrogen that is used to make hard polycarbonate plastic used in bottles and sippy cups.  The bottles or cups with BPA usually are marked on the bottom with a 7 or “PC.”  BPA can leach into the liquid in the bottle or cup and can affect your child.  When I heard about BPA, I automatically ran to Babies R Us and bought all new bottles.
These are the BPA free bottles that my son has tried:

1. Born Free: The nipple on these are similar to the Avent, so if that is what your baby is used to, these may be a good fit for you.  They have an extra valve inside which have to be cleaned, but it is supposed to help with gas and they are not very leaky.  My son didn’t like these because he likes the standard thin nipples instead of the wide ones that the Avent and Born Free use.
   
2. Dr. Brown’s glass or  polypropylene bottles: My son loves these bottles!  They have the standard nipple and they help with gas.  They also have the extra vent valve system which is a pain to clean.  It requires an extra bottle brush to clean the tiny holes in the vent.  The glass bottles are pretty heavy, so they are not the best for self-feeding.
3. Evenflo glass bottles and Classic Tinted Polypropylene bottles: These are a great cheaper alternative, but they do tend to leak a bit.  The nipples are a harder silicone, but any other standard sized nipples fit these bottles.  We like the Dr. Brown nipples the best.  The glass bottles are also pretty heavy.  When my son is really hungry and is sucking pretty hard, the nipple can compress and prevents the milk from coming out.  If you loosen the cap a bit, it can help, or thin out the formula with a little extra water.  I have even tried stage 2 and 3 nipples, and it doesn’t help.
4. Playtex Drop-In nurser:  The actually bottle has BPA, but the plastic liner that you use in the bottle is BPA-free.  These are convenient if you don’t feel like cleaning out the inside of your bottles.  You do have to buy the liners separately, but they do sell off brands such as the BJ’s Wholesale Club which cost half as much as the Playtex liners, but fit the Playtex bottles.  They have a wider nipple like the Born Free and Avent.  The only problem with these that I have found is that the Environmental Working Group said not to use the liners because “The soft plastic liners can leach chemicals into formula, especially when heated.”
5. Medela bottles: I have only found these in the 5 oz bottles, so it‘s not great when you need to make larger bottles.  I was surprised how much these leaked because I love the Medela Pump In Style and I assumed that all of their products were great.  It is convenient because the bottles are interchangeable with the pump, so you can pump right into your bottles.
6. Adiri Natural Nurser: I couldn’t get past the shape of these bottles.  It is supposed to help with nipple confusion because it is shaped most like a breast.  It was a pain to fill and it leaked a lot.  I have heard that many breastfed babies will take to this bottle if you haven’t had any luck with other bottles.
7. Nuby bottles:  These bottles are cute and strong, but have a different kind of nipple.  My son couldn’t get used to them (the flow was slower than he is used to), but the Dr. Brown nipples worked with these bottles.  They are pretty cheap too.