Yeah mine have all done the same as well, I cold water sterilise and usually leave them In the water until needed so I blamed that but maybe not after all.
Not sure if its true but someone told me months ago if you contact MAM they will replace them for you free of charge if the measurements have rubbed off xx
@Becca oh wow.. might give it a go! 😬
I think it was my MIL that told me it, she works in a primary school and one of the parents told her so deffo not sure how true it is but its worth a go! xx
Yep we've had the same issue but for my elder boy who has made very good use out of his bottles.