Contains (4) Dr. Brown’s Natural Flow Anti-Colic Options+ Narrow Baby Bottles 8 oz/250 mL, with Level 1 Slow Flow Nipple, 4 Pack, 0m+ (1) Dr. Brown's Clean Steam Baby Bottle and Pacifier Sterilizer and Dryer ANTI-COLIC BABY BOTTLE. Anti-Colic internal vent system is clinically proven to reduce colic. Decreases spit-up, burping and gas. CONSISTENT FLOW RATE. Vacuum-free feeding is closest to breastfeeding and Dr. Brown’s silicone nipples provide a consistent flow so babies can feed at their own pace. PRESERVES NUTRIENTS. The anti-colic vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better night’s sleep. BREASTFEEDING BOTTLE. The breast-like nipple shape encourages a proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle and back again. BABY BOTTLE STERILIZER. The sterilizer eliminates 99.9% of bacteria, mold and the yeast that causes thrush. MULTI-FUNCTION BOTTLE STERILIZER AND DRYER. Easy-use operation lets you sterilize only, dry only, or combo sterilize and dry. FITS ALL DR. BROWN’S BOTTLES. Dr. Brown’s sterilizer and dryer for baby bottles includes a removable basket that is designed to fit all Dr. Brown’s bottles perfectly.