The Dr Brown s Options + Gift Set offers an easy and comfortable way to feed your little one, adapting to their needs as they grow. With the unique design, these bottles can be used with or without the removable internal patented vent system transforming it into a teat-vented bottle for more convenience. This handy little gift set is ideal for a new parent, containing bottles of varying sizes, a soother, a teether and a bottle brush.Reduces reflux and colic for a happier childNatural feel to encourage normal feedingBPA-free siliconeAll about meThe unique internal green vent system continues to create 100% vacuum-free feeding, which is clinically proven to help reduce wind-related colic. This is what makes 9 out of 10 healthcare professionals recommend Dr Brown s for the relief of wind-related colic. As baby becomes more developed the bottle can be used without the green vent system to work more like a conventional, teat-vented bottle.The Dr Brown s scalloped designed teat allows air to vent through the bottle when the green vent system is not used, either when your little one’s feeding is developed or parents just want the convenience of a teat vented bottle.