I could have written the exact same post. My DD has been so fussy and clingy this week, won't eat her normal food but is still drinking as usual. Her nappies haven't been as wet as normal but she developed a temp yesterday and now has a cold. When I read your post I was thinking maybe it has just been the heat but what also came to mind was teething or growth spurt? They can do all kinds of funny things to kids Also, when you're pregnant your milk changes so maybe that could have something to do with it also?!

I'd just keep an eye on her and watch out for other signs of dehydration. Hydralite couldn't hurt though

Sorry wasn't much help!!