Whether you're breastfeeding, formula feeding, or combining both, the award-winning Zerø.Zerø™ Bottle gives you the freedom to feed your way. Designed to closely mimic the physiology of breastfeeding, this innovative anti-colic bottle helps make transitions between breast and bottle feel more natural for baby, all while expertly reducing colic. Its patented anti-colic silicone bag collapses as baby feeds to help reduce swallowed air, gas, and discomfort, while the unique Adaptable flow nipple allows baby to feed at their own pace, similar to breastfeeding. Thoughtfully designed and made in Spain, the Zerø.Zerø™ Bottle is here to support smoother transitions between breast and bottle. Because feeding journeys aren't one-size-fits-all, the Zerø.Zerø™ Bottle gives families the flexibility, confidence and freedom to feed their way. 6oz Zerø.Zerø™ Small Bottle: comes with Adaptable Flow Asymmetrical Nipple (0m+) 9oz Zerø.Zerø™ Large Bottle: comes with Medium Flow Asymmetrical Nipple (3m+)