Preparing bottles of formula on the go can be a very messy undertaking, requiring the use of plastic bags and separate containers. With the Bouche Baby TAKE N" SHAKE® Feeding Bottle with Integrated Formula Compartment (9 oz), mixing formula doesn"t get any easier. Simply add pre-measured formula to the compartment, attach the sieve, add water into the bottle, seal, and go. When you"re ready to feed your baby, simply unscrew, flip, shake, and serve. The specially designed sieve ensures no formula clumps. Visit the how-to video: http://bouchebaby.com/pages/how-to This doctor-approved, ultra-safe system is BPA-free, includes colic prevention nipples, and has passed international safety standards. This safe, convenient, multi-stage baby to toddler feeding system is also baby approved. In independent focus groups, babies and toddlers selected this bottle over others due to its whimsical, toy-like colours and design. The system is designed to follow the baby through to the toddler years as it easily converts to a standard bottle when formula is no longer required. In addition, it also can be used as a sippy cup, so the transition from baby to toddler is even more seamless because of the familiarity with the look and feel of the product. This is a great value for parents as no new bottle or sippy cup will need to be purchased since the system can be used from birth up to 4 years. Dishwasher and microwave safe, the bottles are also the easiest on the market to clean as the base can be easily removed. Additional formula compartments and standard baby feeding bottles (without formula compartments) are also available.