a miniature human, usually between the age of 1 day to 18 months, not yet sleeping in a "big bed" and requiring an inordinate amount of time, energy, money and patience. baby, infant, toddler, child.
"yeah, it sucks. none of my friends go out anymore since they cranked out a bunch of crib lizards."
"...party at jim and sally's, 7PM, crib lizards optional..."