Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Many Leaks!

I purchased these bottles only because I had planned to breast feed and I had done research that the Avent brand was excellent when switching back and forth from breast feeding to bottle feeding. I was unable to breast feed so I am using the Avent full time. For the first few weeks they were fine but we have had a lot of problems with leaking. Its very frustrating! Sometimes we have to change our sons clothes because formula has leaked down the front of him. We really only keep using them because we received so many at our baby shower.