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Title: spout is hard to use
Review: We've tried a variety of sippy cups and these are among my least favorite. They're not bad in terms of durability and my son doesn't seem to have a problem gripping them. But the spouts have started to give us trouble. My son has to suck so hard on them that he collapses the rubbery top part. I have to constantly unscrew the lid to release the pressure and the spout pops back out. He's fine for a few minutes and then we have to unscrew the top again.We use other brands of cups with the same soft top/valves and don't have this trouble.
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