Simply add this top to a regular-mouth glass mason jar or Silicone Mason Bottle to transition baby to a sippy. Then once they've mastered that, add the straw insert to quickly graduate your toddler to a straw cup.
Simply add this top to a regular-mouth glass mason jar or Silicone Mason Bottle to transition baby to a sippy. Then once they've mastered that, add the straw insert to quickly graduate your toddler to a straw cup.