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Title: Not worth the pain
Review: These bottles are just not worth the pain. I agree with other users, they just leak way too much. Then, the directions tell you not to tighten the collar too tight, yet if you have it too loose, the nipple is too fast. There are all these different instructions on how to properly install these. It's just not worth the headache, especially at a 2am feeding. Also, my baby still spits up and has gas when using these but I have yet to find a bottle that would eliminate spitup and gas.
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