The Dr. Brown's baby bottle bundle includes the Anti-Colic Options+ Narrow Baby Bottles and First Feeder Bottles to meet all of your newborn's feeding needs. The Anti-Colic bottles feature the ultra slow-flow Preemie nipples perfect for premature or struggling feeders. The innovative internal vent system reduces negative side effects like colic, spit up, gas and burping. The nipple shape and vent system preserve nutrients and ease digestion as well. These BPA-free 2oz narrow bottles come in a set of 4. The First Feeder bottles allow accurate measurement of small volumes of breastmilk or formula. With clear markings from 1-15cc, these bottles are ideal for a newborn's first oral feedings. The bottles fit all Dr. Brown's nipple sizes and flow rates. These reusable BPA-free bottles come in a set of 3. Together, these two bottle sets cover feedings for even the littlest babies. The Anti-Colic bottles provide a slow, gentle feeding experience with less air intake to reduce gassiness. And the First Feeder bottles let you control and measure every precious drop. This bundle meets all of a newborn's bottle feeding needs while focusing on their comfort and nutrition.