The Dr. Brown's bottle bundle includes their popular anti-colic bottles designed to reduce spit-up and gas. It contains 6 slow-flow Level 1 preemie nipples for babies with feeding difficulties, along with 1 5oz anti-colic wide-neck bottle to grow with your baby. The preemie nipples feature an ultra-slow flow rate to prevent choking and aid digestion in premature or struggling infants. Its breast-like silicone shape supports proper latching and an easy transition between breast and bottle. The bottles' internal vent system is clinically proven to reduce colic while preserving nutrients. The 150mL anti-colic bottle comes with a slow flow Level 1 nipple ideal for newborns. Its wide neck design allows easy cleaning and filling while accommodating different nipple flows as your baby grows. Like all Dr. Brown's bottles, it has a vent system to reduce gas and spit-up. The nipples encourage natural feeding behavior and easier switching between breast and bottle. With the preemie nipples for early feedings and a bottle to grow with your infant, this bundle provides a complete feeding system focused on healthy digestion. The anti-colic vent technology and breastfeeding-like nipples aim to make bottle-feeding more comfortable for both parents and babies.