The Dr Brown’s Natural Flow Options+ Anti-colic Glass Baby Milk Bottle’s breast-like nipple shape encourages a proper latch for a more natural bottle-feeding experience. Designed alongside medical professionals, the correctly contoured nipple shape and high-grade, soft silicone offer a more comfortable feeding experience and help to avoid nipple confusion. The anti-colic internal vent system features an enhanced design to improve an already innovative feeding experience. The pharmaceutical-grade borosilicate glass is heat and thermal shock-resistant, withstanding hot, cold, and gradual temperature changes. Available in two sizes – 150ml/270ml.