The Baby Brezza Formula Pro ($179) is the easiest way ever to make bottles, letting you prepare an air-bubble-free bottle with the push of a button. The machine stores water and formula in airtight compartments, then measures and mixes them to the perfect temperature (about 98 degrees) in any bottle you choose. You choose the amount of formula you want to make, from two to 10 ounces, press start, and your baby's next meal is ready just seconds later.