What's in the box? 2 x 150ml 2 x 250ml 2 x Slow Flow Nipple (For ages 0-3 months) 2 x Medium Flow Nipple (For 3-6 months) 2 x Fast Flow Nipple (For 6+ months) Comotomo Baby Bottles feature innovative and sensible designs to most closely mimic natural breastfeeding. Our naturally shaped, soft, silicone nipples are ideal for babies who have trouble transitioning from nursing to bottle-feeding. Your little one will love to hold onto the skin-like, soft, and squeezable body that is like no other bottle in the world. Our bottles are equipped with truly innovative vents that are smartly designed to prevent colic, while completely eliminating annoying leaks. They are quite possibly the most thoughtful bottles ever made.