If you've decided to use glass baby bottles instead of plastic, there's quite a bit of choice out there. But in addition to worrying about leaking and nipple collapse, as you would with any baby bottle, glass bottles are also breakable and heavier than plastic. So to help you find the best glass baby bottles, we put a bunch to the test in our lab, looking at weight, ease of cleaning, assembly and use, leakage and, of course, breakage. Yes, some of the bottles shattered when dropped from counter height, and that was an automatic deal-breaker for us—but a lot of them didn't even have a scratch after being dropped five times, and that was impressive. We also sent samples of each bottle out to families to try them out at home so we could get real-life feedback. Here are the best glass baby bottles, which made the cut to get the Today’s Parent Approved seal.