Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good but expensive

My daughter is now 3 months and I have been using the Avent bottles since she was born. I bought them because I planned to breastfeed, but that did not work out. The only problem that I have is that they leek if they are not screwed on properly, and when your child is hungry, it becomes fustrating. Also, the stages of the nipples are not true to what they suggest. I started off with the stage 1 nipples and then completely skipped over the stage 2, which is susposed to be from 1-3 months, and bought stage 3 (3-6 months) because I felt that she was not getting enough with the stage 2. These nipples are also extremely expensive. A package of 2 is $4.00 and I feel that they thin out quickly and then she starts squirting milk everywhere.