Spill-proof guaranteed with durable soft straw, flip-top lid, and easy to hold handles, Easy stack for clutter-free storage, easy sip rim for open top use as child grows, easy view window lets you see what's inside, Interchangeable lids: lids can be interchanged between any Born Free grow with me cup, Top rack dishwasher safe and naturally free from BPA and PVC, Age: 6 months plus