Introducing Dr. Brown's Options: The market's first convertible bottle that can be used with or without the vent system. The new vent system is designed to grow with baby, and we recommend using this system to experience all the health benefits of our bottle. It helps reduce feeding problems, helps digestion and helps preserve vitamins. Some moms and dads find removing the vent a convenient option as their baby's feeding becomes more developed. The nipple venting creates a paced flow, and provides a feeding experience similar to most nipple-vented bottles. Options bottles fit most breast pumps, and are BPA-free. This Dr. Brown's Options Bottles, 8 ounce, 6-pack set includes fun and colorful designs perfect for baby •Helps reduce feeding problems - Our bottles are known for reducing colic, spit-up, burping and gas •Proven to help preserve bottle milk nutrients - Vitamins C, A, and E are critical for health in infancy •Vacuum-free feeding helps digestion - Good digestion is essential for babies, particularly newborns •Fully-vented bottle design - Closest to breastfeeding •Internal Vent System and silicone nipple work together - Controlled flow so babies feed at their own pace Newest designs for options bottles include I love you too the moon and back with a moon and stars, dream big, adventure awaits with the earth in the shape of a heart, adventure awaits with a bicycle and three balloons, a dream big design with a shooting star, and I love you to the moon and back featuring two arrows and a full moon and a crescent moon.