Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example is below.
Q: I've read this book with much expectation, it was very boring all through out the book
A: Negative
Rationale: Review writer does not like the book because it was boring, therefore it is a negative review.
Q: I love these nipples. I've ordered so many of these because my son will only use this nipple. We have tried the Medela nipples and every other type imagineable that will fit on our Medela bottles, but this is the only one he would use. It's a slow flow which is perfect for him. We will be buying more before we head to Cancun so we can use with the Similac Ready to Feed bottles.
A:
Positive