SOUTH BEND, Ind. -- It’s a scary cute day in the Riley Hospital for Children NICU as the Riley team helped several NICU babies into their first-ever Halloween costumes.

"Instead of hearing ghostly boos in the hallway, there were many oohs, aahs, and squeals of delight from the sheer cuteness," hospital staff said. "The costumes are actually meant for 'Build-A-Bears', that’s how tiny they are."

Here in South Bend, the NICU babies at Beacon Children's Hospital are also celebrating their first Halloween.

SLIDESHOW PHOTOS: 

Sweet Brayden was the most adorable avocado on the unit, while Max was set to take off to space in his astronaut costume.

Crime-fighting identical twins Kane and Zane were Batman and Robin respectively.

X’zaylen, a Pilot was taking off today as he was being discharged!

Psalms was preparing to score the game winning goal as a soccer star.

Another set of identical twins, Parker was prepping for surgery as a surgeon while his brother, Sawyer was flying by the seat of his pants as a pilot.

Dariel was off to Neverland aka dreamland after lunch as Peter Pan.

And finally, fraternal twins Miyori and Messiah were protecting the NICU universe as Ms. Marvel and Captain America.

When babies are born early, some have a wide variety of health problems, they babies are placed in the Neonatal Intensive Care Unit.

In the NICU, babies get around-the-clock care from a team of experts.