My son never took to this cup. He did however enjoy throwing it on the ground which showed me that the cup is not leak proof…lots of watery mess to clean up yikes

While the design is good, It is definitely not spillproof. I made sure the lid was on and closed. It didn’t come off or open but it leaked when it was accidentally bumped over.

This sippy training cup didn’t work for either of my boys and was a complete and total waste of time, wish I never bought it