So...
DS aged 15 months has a bottle in his cot before sleep.
Tonight, I give him the bottle. He starts crying and hands it back. This is very unusual behaviour. So I sniff the milk and think to myself 'well I made this at least 30 mins ago and it's v hot weather, maybe it went off'.
I run downstairs, DS still crying, open a new pack of Aptamil and bring him another bottle. He does the same thing a second time.
I go back downstairs, get cow's milk from the fridge, sniffing the new formula box en route (seems to smell not quite right, definitely).
DS drinks the cow's milk fine.
Later I test the other two boxes of unopened formula I have sat in the kitchen - they both also smell odd.
I've chucked 3 and a half boxes of formula in the bin (ie 25 quid's worth, ha).
Did anyone else have this experience over the last week, with the hot weather - or is it just me!