SEAMLESS BREAST-TO-BOTTLE TRANSITION – Lansinoh bottles for breastfeeding babies make breast-to-bottle transition easier – without confusion or fuss. The soft, flexible nipple supports a secure latch and is designed for smoother feeding transitions GROWS WITH YOUR BABY - Designed for a universal fit on all Lansinoh glass bottles and available in four sizes––extra-slow flow, slow flow, medium flow, & fast flow, Lansinoh nipples ensure the right milk flow for all babies at every stage BOIL BEFORE FIRST USE – Lansinoh borosilicate glass bottles for babies are designed to withstand extreme temperatures. Easy to clean and made without BPA or BPS. Boil all glass bottle parts for at least 5 minutes to ensure hygiene CLINICALLY PROVEN ANTI-COLIC SYSTEM - Lansinoh bottle nipples feature an air ventilation system designed to help limit air intake during feeding, which helps support less gas, fussiness, and spit-up for a more comfortable feeding experience EASILY ACCEPTED BY BABY - Lansinoh bottle nipples are a baby essential: ultra-soft and strong nipples have a wide, gentle slope that molds to your baby’s mouth, ensuring a secure latch for peaceful, comfortable feedings SUPPORTS BABY-LED FEEDING – Lansinoh’s strong yet flexible bottle nipple tip stretches with baby’s sucking motion to help deliver milk at a comfortable pace. Designed to support a smooth feeding experience while helping baby feed at their own rhythm INCLUDES MEDIUM FLOW NIPPLE: This set includes 4 baby bottles with 8-ounce capacity, each equipped with medium flow nipples (Size M, 3-6 months). Designed for babies in their feeding journey