There are two major problems associated with most traditional baby bottles air and vacuum. Traditional and restrictive vented bottles tend to develop vacuums because babies have to suck progressively harder on the one hole in the bottle to obtain the liquid. This causes teat collapse and baby has to stop feeding. Air enters the bottle when the teat reinflates this air is ingested and can cause colic symptoms. The Dr Brown’s Options baby bottles feature a unique system with a removable vent designed to create a ‘vacuum free’ environment. The same trusted bottle, with added benefits. The unique internal green vent system continues to create 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. The unique Dr Brown’s internal vent eliminates the vacuum and air bubbles in the feed, so helping reduce colic and burping. Options grows with baby, allowing easy removal of the vent as baby develops, or no longer experiences feeding problems. 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 new Dr Brown’s scalloped designed teat allows air to vent through bottle when green vent system is not used, offering babies an easy and convenient way to feed at their own pace. Includes 2 x 270ml Bottles.