I've never been to croatia but i've been to slovakia, the czech republic and hungary. The villages probably won't have nappies and wipes - most people use cloth out there, but you'll have no worries in the cities. The only trouble you might have is figuring out what is in packets in hungary - hungarian is like NOTHING else as it's one of the few european languages which is not from latin or slovak origins. Spoken it sounds like one of the native american languages (an american of choktaw descent told me), so get a good guide/phrase book.

Prague is getting more and more expensive now as so many western europeans are going there, bratislava is less so (but it's not as nice, lol). Budapest is one of the most beautiful cities on earth - the glory of the Russian Empire crumbling away with time and neglect like the face of an aging beauty queen. Very moving, take lots of pics. Oh and take your kids to the cave museum under the hill - they'll remember it forever!

Bx