Dr. Brown's bottles feature a patented internal vent system that eliminates the vacuum and air bubbles to help reduce colic, spit-up, burping and gas. The positive pressure design allows babies to feed comfortably, because the vent system eliminates the air bubbles and vacuum. Helps maintain vitamins C, A & E plus lipids. Easy to clean, dishwasher safe, BPA free. • Clinically proven to reduce colic • Decreases spit-up, burping, and gas • Shown to better preserve nutrients in breast milk and formula • Aids in digestion for a good nights sleep • Offers a flow rate that supports breastfeeding • BPA free, dishwasher (top rack) and sterilizer safe #Dr #Brown's #Options+ #9oz/270ml #Wide #Neck #Bottle #Conversion #Kit #(1-pack)