The most natural way to bottle feed. Natural nipple shape makes it easy for baby to combine with breastfeeding;Soft， wide-shaped nipple promotes natural latch on;Advanced anti-colic system is directly integrated into the nipple with no extra hard-to-clean parts;Wide neck opening makes it easy to fill and clean;A range of flow rates are available for your growing baby. This bottle includes a 1Month+ Slow Flow nipple;Nipple is soft and breast shaped to promote comfortable latch on;Twin valves prevent babies from swallowing air to reduce colic;Ergonomic bottle is easy for parents and babies to grasp;Wide neck makes filling and cleaning easier;BPA free polypropylene material is easy to sterilize