Instruct: Classify Amazon reviews into positive or negative sentiment
Query: avant bottles leak, big headache

my son had no problems with the nipple or the shape of the bottle (holding it in his little hands). however, this bottle leaks and it's a nightmare to deal with. as another reviewer wrote, you turn it too much and it leaks, you turn it too little and it leaks.i can't count the number of times the milk leaked from under the cap over his face, neck and clothing. in the middle of the night,it's even more of a headache. i wrote to avent about this problem and i'm sure they have received other complaints. they should have recalled these bottles...if the product does not work in the way it's supposed to, ie. feed your child in a clean, effective, safe manner, then it should not be on the market for people to purchase.