I've heard that glass bottles are better than plastic bottles. But won't glass bottles be a risk to the baby if he or she drops it while feeding?

The main problem with plastic baby bottles is that some of them are made with polycarbonate plastic. Polycarbonate plastic is now known to leach a compound called bisphenol A, or BPA, a chemical that may cause developmental hormonal disruptions in young children as it mimics estrogen in the body. By nature, glass is free of BPA. Glass is also easy to clean, and can be easily sterilized in boiling water. These days, baby bottles are made of tempered glass, which is harder to break than regular glass. Glass bottles last longer and can also be recycled more readily than plastic baby bottles. Despite all that, glass baby bottles, even tempered ones, will break if not careful. Glass is also heavier than plastic, making baby bottles more prone to be dropped and able to cause more damage when thrown. Glass bottles are also more expensive than plastic bottles. I would suggest you look for plastic bottles that are BPA free. Newer baby bottles in the market these days are made from BPA-free plastics, such as polypropelyne and are labeled as such. http://www.livestrong.com/article/167283-plastic-vs-glass-baby-bottles/