Thought others might be interested as a while ago I put a post on about annoying bottles with teats sucking in and collapsing. I bought a Heinz baby basic bottle for about $7 and it has a clever teat with 3 vents so the seconds it suck in it automatically realeases!!! It's great. I'm going to try to find the teats sold by themselves and replace all mine!
DD#1- 2004, DD#2 -2006, DD#3 -23/10/08.