Quickly converts Thinkbaby Sippy Cup into our award winning thinkster! Designed to fit all Thinkbaby 9oz bottles.

• No spill spout – features our cross cut design.
• Extra soft, medical grade silicone, straw provides easier transition from baby bottle feeding to Sippy Cups to our straw bottle – The Thinkster. We have won multiple awards based on the ease of transition of our line. The only line that goes from newborn to 48+ months all with the same bottle!!!!!!
• Free of Bisphenol-A (BPA), phthalates, nitrosamines, lead, PVC, PET, and biologically harmful chemicals.
• Includes one thinkster swivel top and straw.
• Perfect for 16 to 48 months
• Reduces environmental waste and pocketbook waste