The phrase "one's little munchkin" is a term of endearment used to refer to someone's child, particularly when they are small and cute. Full definition
Well, with little munchkins I find that I have to launder the bath mats at least once a week! (makingahouseahome.net)
Munchkin has some great new bath products to entertain your own little munchkin in the bath - check»em out: Gone Fishin» Bath Toy - it comes with a fishing pole to cast and «fish» for the three aquatic toys (a crab, fish and star). (mommieswithstyle.com)
It allowed me to bathe my messy little munchkins at the same time — saving me both time and sanity. (romper.com)