With the Pigeon Slim Neck Bottle, you can provide your baby the best possible feeding experience. The bottle has a flexible breast that promotes the infant's natural sucking behavior. For dependable and long-lasting use, it is composed of silicone rubber material with exceptional heat resistance. To ensure safety, it also has an anti-colic air ventilation system (Avs) that reduces the amount of air that is swallowed. The supple, elastic breast makes sucking effortless and promotes the tongue's peristalsis. You can even modify it to regulate the milk's flow. The nipple facilitates effortless latching and permits your baby's natural tongue movement. The baby bottles are long-lasting, easy to clean, and BPA-free.