Mixie 2-in-1 Formula-Mixing Baby Bottle - Made in the U.S.A. Are you frustrated with mixing formula bottles on the go? Ever spill formula everywhere in the process of a midnight feeding? Don't worry-Mixie is here! Introducing the first baby formula bottle that can be fixed now and mixed later. Babies and busy parents love Mixie because hunger simply has no patience. 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. The result? A solution so perfect it satisfies the little one and everyone in the family can sleep happily ever after. This set includes 2, 4oz bottles and 2 Stage 1 Wide-Neck, Colic-reducing, silicon nipples. Also 2 caps to keep nipples clean.