These are always great, at first....

For whatever reason this brand of bottles and sippy cups end up with holes in the tip over time. And then they dont just leak. But pour out. Everywhere. The hole isn't just a hole. It's made up of tiny triangle flaps that all come together. Which works great in the beginning of use. But over time those triangle flaps break off leaving an opening, thus ruining the leak proofing. My daughter does not chew on them and I'm not rough when washing them. But I've been replacing nipples since we got these bottles and cups for my first daughter who is 4.5 now.

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