DS is moving on to size 2 teats... Do I really have to throw away these size 1s? Seems like such a waste, can't I put them away, then when the time comes wash, boil, sterilise them and use them for the next DC?? 
Also does anyone know if I can use the normal tommee tippee closer to nature teats (with the square vent thing) in their anti-colic bottles? We use a mixture of normal and anti colic bottles so would be simplest if we could just use 1 kind of tear across the board.