Natural feel spout: Bite-resistant, soft silicone spout feels natural to them, for a gentle start to their drinking journey​ Leak-proof: Smart two-piece valve stops spills, meaning less mess and less stress ​ Hinged cap: The cap is attached (so it won't get lost in your bag), and helps keep the spout clean between sips ​ Keeps track: Clear measurement markers up the base of the cup shows you how much they're drinking ​ Supports sipping journey: Ready (when they are) to support your baby's transition from breast or bottle to drinking from a spout. This cup is suitable for babies 4 months+