Even as our first Avent cup even these are in continuous use. So far, we are still not noticed "defects" we ordered some time ago a set, in this, there were a few inserts a bubble-formation, this had to be sorted out. We use the cup for filling of cooked food and for freezing. After thawing and before heating in the microwave, we fill the food to, however, and rinsed the cup with the hand ...