Don't worry-Mixie is here! Introducing the first baby formula bottle that can be fixed now and mixed later. This very smart, one-of-a-kind baby formula bottle is so expertly designed, it can be filled in advance and mixed at feeding time. Just pop the button to release the powder formula & shake to blend. Mixie’s compartment lid acts as a free-floating agitator to effectively mix formula while eliminating powder clumps . The result? A solution so perfect it satisfies the little one and everyone in the family can sleep happily ever after.