This baby bottle bundle from Dr. Brown's pairs a 9 oz anti-colic wide-neck glass baby bottle with a level 1 slow flow nipple and a set of level 2 medium flow silicone nipples to support your baby's feeding needs as they grow. The anti-colic glass baby bottle features Dr. Brown's clinically proven internal vent system to reduce colic by decreasing spit-up, burping, and gas. Its vacuum-free feeding mimics breastfeeding so baby can feed at their own pace. The vent system also helps preserve nutrients and aids digestion. The included level 1 slow flow nipple is recommended for 0+ months. Its breast-like shape encourages proper latching to ease transition between breast and bottle. The set of level 2 silicone nipples are designed for 3+ months when babies increase feeding volume. Their medium flow rate provides a consistent vacuum-free feeding experience closest to breastfeeding. Like the level 1 nipple, its breast-like shape supports proper latching to make feedings more comfortable and natural as babies grow. Both Dr. Brown's nipples work with the anti-colic vent system to reduce colic symptoms and preserve nutrients. With options to adjust flow rate in one trusted bottle, this bundle simplifies bottle feeding. It allows you to provide the most comfortable, nutritious feeding experience tailored to your growing baby's needs.