Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I Really Wanted This To Work

I love the idea of using glass rather than plastic bottles. Sadly, these just didn't work. I bought the silicone nipples to use, and they just collapsed while my baby was drinking - she couldn't even get anything. When I buy a product, it should be fit for its intended purpose. Here, this is a bottle and my daughter should be able to drink from it, but was unable.I read others' reviews, suggesting to use the Dr. Brown's piece in order to let airflow. I don't think I should have to go out and buy something else for the bottle to work. Also, aren't I still using plastic if I use the Dr. Brown's plastic piece? Sadly, I had to return them. :(