Instruct: Classify Amazon reviews into positive or negative sentiment
Query: More of a hassle than mid-night tummy aches.

I bought at least 3 dozen of these bottles before my second son was born. I soon learned that the bottles were a pain. First, my son could not get anything out of them, he would be crying to drink and very little formula would come out of these bottles/nipples. Finally I used them with a Gerber nipple and the problem was solved! Then the leaks began, if the bottles were not sealed perfectly (and sometimes when they were) they would leak. Then the cleaning issue. They come apart at the base for the vent and the rubber seal to be washed so it's extra little bottle parts and washing for Mommy. I would not reccomend these to anyone. I am pregnant with my third baby and will stick with Health Flow.!