What are Dr. Brown's bottles used for?

According to the Dr. Brown’s website, its bottles are used for feeding babies. These bottles have a patented internal vent system that prevents colic and mimics breastfeeding so that babies can feed at their own pace.

Dr. Brown’s baby feeding bottles come in various types. The bottles have standard, wide-neck and glass variants. The bottles may also come in pink or blue colors. The benefits of using Dr. Brown’s bottles, according to the brand’s official website, are that they help preserve vitamins C, A and E; promote vacuum-free feeding; and help prevent colic, gas, burping and spit-ups. The bottles are free of BPA, lead, phthalates and PVC.