The public can vote on their favorite costume until noon Oct. 31 on the hospital's Facebook page.
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WLS-TV reports, babies at two of the hospital's campuses will participate in the contest, which awards winning parents with a Babies 'R' Us gift card.
Last year, more than 40 babies joined the contest with parents transforming the preemies into superheroes, mermaids, Star Wars characters and even Hostess Twinkies.
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The NICU is where critically ill infants are cared for after experiencing a premature birth or other medical complications. Sometimes they are there for months of intensive care.
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