The enhanced design of the Dr Brown’s Options Anti-Colic Bottle is clinically proven to reduce windy colic due to Dr Brown’s unique 100% vacuum-free vent system. Dr Brown’s Options bottles offer an easy and comfortable way to feed your little-one, adapting to their needs as they grow. With the unique design, this bottle can be used with or without the removable internal vent system, transforming it into a teat-vented bottle for more convenience. Use Dr Brown’s Options bottles from birth – don’t wait until your baby develops colic! Contains 2 x 5oz/150ml Bottles, 1 x 9oz/270ml Bottle, each bottle is supplied with a Level 1 Teat, 2 x Level 2 Teats and 2 x Level 3 Teats.