Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Absolute Nipples Worst We Tried

Perhaps the bottle/nipple combination works well for some babies, but for ours the flow rate was so slow as to render it unusable. Changing to the #2 nipple with a faster flow rate did not change things. It might not have been the nipple hole size per se, but how hard it is to squeeze the nipple to get anything to come out. Extrapolating from 15 minutes, it would have taken our baby 75 minutes to finish a 100cc bottle. And our baby is a successful breast feeder and can eat from ANY other bottle/nipple combination.