sweet bottoms

Okay, so I know this is going to be a bit disturbing to you, because frankly it is disturbing to me.  I have recently noticed, while checking to see if the twins have dirty diapers, that their tushes smell SWEET... like COTTON CANDY!  REALLY!  I told you this would be disturbing!  I have not yet had the chance to research it online.  Maybe it is a sign that something is wrong?  I really have no idea what is going on.  All I know is that when I smell cotton candy tush I need to go change a dirty diaper!  Have you ever heard of such a thing?  Randomness, I know.