Philips Avent Natural Response Giraffe Bottle 260 MlPhilips Avent Natural Response 260ml bottle with a soft silicone teat, T3. The Natural Response teat releases milk only when the baby is actively drinking and creates a natural grip, thanks to its breast like shape. With the Natural Response teat, babies can drink at their own pace, just like at the breast, making it easier to combine breastfeeding and bottle feeding. The teat has a unique opening that only releases milk when the baby is actively