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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

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