Woessner's family released two new pictures of the boy on Monday. They show him walking down the hospital hall with his father and sleeping in his hospital bed.
"Nathan is listed as in good condition and continues to improve. He returns to a regular diet today and can leave his room to visit the playroom," Dr. Dana Mitchell, University of Chicago Medicine Comer Children's Hospital, said through a statement.
On Sunday, the boy's grandfather said Nathan may go home as early as the end of the week.
Mt. Baldy remains closed indefinitely. Park officials believe the rest of the Indiana Dunes are safe.