Bottles for all! We carry unique bottles for breast fed and formula fed babies! Make the transitions between breast and bottle seamless with the Adiri NxGen Bottle! The bottom petal vent allows consistent air flow to prevent colic! With Mixie, bottles can be fixed now and mixed later! To use simply fill the bottom compartment with formula and the rest with water as normal. When hunger strikes push the bottom button to mix the two together and shake! Yes, it's that easy!