Dylan J. Wood, 23, is charged with aggravated assault. He was arrested last Saturday by troopers and taken to Kennebec County Jail, where he has since been released on bail.
Wood's infant son, 8-month-old Blaze Wood, has been hospitalized at Maine Medical Center in Portland with serious injuries since the alleged assault on Jan. 2.
State police detectives worked on the investigation with the Kennebec County District Attorney's Office.
The decision was made last week to charge Wood with the felony assault charge.