I did TONS of research on bottles when I was registering. I learned from a couple different mother review websites that the glass Evenflo bottles (available on babiesrus.com) were the best. Obviously glass doesn't leech chemicals which makes them super safe, but on top of that many of the mothers said there babies had less colic and gas when compared to their plastic counterparts. I didn't find any complaints on chipping or breaking which is and obvious concern for any mother. I wanted to see how they stood up to drops and falls so I dropped one off of my porch (higher than a baby's stroller) on to cement and no breakage. ALSO, these bottles are super cheap. Only 10 bucks for a 6 pack. Born Free is like $34 for a set of 4, big difference. However, I do think the bottles are a little heavier for a baby to hold on its own but good for a two year old. Hope this helps.