Tommee Tippee Sippy Cup Making Loud Air Noise and Cap Loosening

We bought a Tommee Tippee sippy cup two weeks ago, and while my twin daughters have no issue drinking from it, there’s a loud air noise every time they take a sip. It’s not a minor sound—it’s loud enough to wake one twin when the other drinks at night. It seems like air is coming from somewhere, but...





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