We’ve made it. At 4mo+, start with this 2-in-1 Glass Training Cup, which is fitted with an interchangeable bottle nipple to silicone spout to help ease your baby’s transition from breast to cup in their first drinking endeavors. 100% watertight and leak-proof, open or closed or upside down. Use the cup at home or on the go – it has been specifically designed with spill and temperature control in mind. Training cup nipples are interchangeable and made from 100% supple silicone. The handles, which help baby hold the bottle, can be removed as needed as they grow & gain confidence. Evolves as your child grows, this cup was designed to encourage your little ones’ independence while learning to drink on their own.