If the kids are super-cranky all day long, to a degree rarely, if ever, encountered AND
If they hardly eat anything in the afternoon or at dinner, contrary to their usual "need to eat something every 2 hours or they might waste away" stance on food in general AND
You actually remark to your significant other after the littles ones have gone to bed that you suspect they might be getting a stomach bug THEN
Just listen to yourself, know that you are right, and prepare for the inevitable before you go to bed.
So far, it's just Miss M, but nothing could have surprised me less than what happened at 2 o'clock this morning!
Wish us luck, and if blogging is sparse for a couple of days, you'll know why: Pukinson's Disease strikes again!