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Title: Needs a "how to" manual!
Review: We have used these bottles for the last three months and our son has easily gone back and forth between the breast and bottle since he was born. These bottles were wonderful for that!! HOWEVER, I had a heck of a time with them leaking after about three weeks of use. I couldn't figure out what was wrong, but my husband realized, like many others have, that the seal is broken if they are tightened too much which causes them to leak. Since we found this out I have not had a problem and am enjoying them again.
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