Police say they're investigating a suspected case of child abuse on the 1700 block of Taft Avenue in Oshkosh.
It's why emergency crews flew a three-year-old girl to Milwaukee Children's Hospital early this morning.
Authorities say she has substantial head injuries.
Police say they talked with a 24-year-old man at an Oshkosh hospital and arrested him on suspicions of child abuse.
Officers say the Oshkosh man isn't a member of the girl's family but was her caretaker.
They didn't elaborate.
"It's very difficult," officer Katherine Mann said. "Being a mother myself, makes it even harder, so yeah. It's a very difficult investigation for everybody involved in it."
Local attorney's also say these can be difficult cases to deal with - not just emotionally - but also in gathering evidence.
"You're dealing with a victim here, alleged victim, that is often times unable to articulate what occurred," attorney Jeff Mann said.
Mann says the severity of the injuries play a big part in what happens next.
"You rely very heavily on the medical reports," he explained. "I would say doctor's testimony and expert testimony in general plays a large role."
Police gave the case to the district attorney's office for review.
