The new vent system is designed to grow with baby, and its recommend to use 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 and made in the USA. The Power Of Choice: This innovative bottle effectively and efficiently covers all parents’ needs. Dr. Brown’s Options grows with the needs of your baby and offers healthy benefits whether your little one is experiencing feeding challenges or not. Options gives you the power of choice Three 8oz bottles Two 4oz bottles Five Level 1 silicone nipples Two Level 2 silicone nipples Two storage/travel caps Three Cleaning brushes Instructions