The most common reason why the sippy cup can leak is the straw is damaged and needs replacing or the o-ring inside the lid is missing or dislodged.
Step 1. Determine where the leak is coming from
Step 2. If the leak is between the cup and lid, check the silicone seal in the groove under the lid is securely in place. On occasion, with use and washing, the o-ring may slip out of place. You can watch our instructional video on how to insert the o-ring. If the oring is damaged or missing, we sell replacement orings in a handy twin pack.
Step 3. If your sippy cup is leaking from the top of the straw, it is likely the valve has been worn out - totally normal with babies and toddlers. The good news is, we have replacement straws available and they are easy to change over.
Step 4. Make sure the entire triangular top of the straw passes through the lid so your straw is in the correct position.
Top tip: Make sure you are extra careful when cleaning the straw top as the valve can tear. We recommend using our straw cleaner or cleaning brush set to gently and thoroughly clean your straws.