LINCOLN, Neb. (AP) — A 23-year-old Lincoln man has been sentenced to 30 months to five years in prison for fracturing his 3-week-old son’s skull.

Koty Buesing was sentenced Tuesday. He had pleaded guilty to negligent child abuse resulting in serious injury.

According to authorities, the child’s mother noticed swelling on the left side of his head on Dec. 19. Authorities say Buesing told her he had accidentally hit the baby’s head under the kitchen table when he picked him up off the floor while making him a bottle.

Police say the parents took the child for a checkup on Christmas Eve and were referred to Children’s Hospital in Omaha, where the baby was treated for a skull fracture and bleeding on the brain.

A doctor told investigators the boy’s injuries were suspicious.