Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

I gave these bottles every possible chance with my son. They just don't work for him. The nipples either collapse (I have never heated them in the microwave) or he just can't get any milk out. Maybe I should try the stage 2 nipple but I'm just too disappointed at this point. I thought if I gave him a week to develop a stronger sucking reflex then he could use them better. I was wrong!!! And the extra time cleaning them is a hassle and what new mom needs that?