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Title: My kids can't figure it out.
Review: My three-year-old and 18-month-old were both excited to try these cups when I brought them home, but now the baby gets angry when she sees it coming, and the toddler is also frustrated. The straw has a valve that closes off completely if the straw is not held slightly closed with the teeth. Both children were sucking like crazy and not able to get anything out. Even I wasn't able to before I took it apart to figure out what the problem was. I tried showing the baby and explaining to the toddler how it works, but they weren't able to understand.What a waste of money.
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