Instruct: Classify Amazon reviews into positive or negative sentiment
Query: As an infant teacher..

I wouldn't recommend these bottles. There ae many others out there with the same benifits, minus the hassle. I can't even COUNT how many times I have been soaked in a mother's breat milk because of the leakage. I have tried screwing them extra tight, I have tried screwing them on the looser side, ... I have even tried putting them on crooked! LOL They don't leak all the time, but when they do, watch out! It comes pouring out like a river! Personally, I used the Playtex disposible bottles. You can get the same great "mother like" nipples, same easy clean-up, same gas reduction, and a LOT less leakage! None.. Imagine that?! If you're gonna use the Avent bottles, make sure you have some extra milk/formula, for those occassions you lose half the bottle on you lap!