Anti-colic baby bottle. Anti-colic internal ventilation systems are clinically proven to reduce colic. Reduce spit-up, burping and gas. Consistent flow. Vacuum-free feeding is the closest thing to breastfeeding, and Dr. Brown's silicone nipples provide a steady flow so baby can feed at his or her own pace. Retain nutrients. Anti-colic ventilation systems are proven to help retain the nutrients in bottled milk and aid digestion for better sleep. Breastfeeding bottles. Breast-like nipple shape promotes proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle. The bottle grows with your baby. Baby bottles work best with a built-in ventilation system, but can be removed as baby's feeding progresses - no need to introduce a different bottle. Sustainable baby bottles. The wide neck bottles are designed to provide nutrition for babies during all stages of feeding and are recyclable.