Lansinoh baby bottles make feeding easier for breastfeeding babies with soft, flexible nipples that support a secure latch. These borosilicate glass bottles grow with your baby, offering four flow sizes from extra-slow to fast flow for every stage. The clinically proven anti-colic system reduces air intake during feeding, helping minimize gas, fussiness, and spit-up. Ultra-soft nipples with a wide, gentle slope mold to your baby's mouth for comfortable, peaceful feedings. The strong yet flexible nipple tip stretches with baby's natural sucking motion, supporting baby-led feeding at their own pace. This set includes four 8-ounce bottles with medium flow nipples, perfect for three to six month old babies. Easy to clean and durable, these bottles are made without BPA or BPS and can withstand extreme temperatures. Boil all parts for at least five minutes before first use to ensure safety and hygiene.