The Lakeland dad accused of fracturing his 3-month-old son's skull by head-butting him last week will be arraigned on aggravated child abuse charges Oct. 9, authorities confirmed.

Jeremy Miller, 22, was arrested last Thursday after Florida Department of Children and Families became suspicious of his explanation for his son's injuries while at Tampa General Hospital.

Detectives said Miller first tried to explain the infant's injuries by saying he hit his head on a door and on the corner of a changing table, but he later admitted to hitting the child's head with his own head while rocking him.

According to detectives, Miller said he was frustrated over a disagreement with his wife.