YAKIMA, Wash. — Prosecutors on Wednesday filed a charge of second-degree assault of a child against a young Yakima mother accused of injuring her 3-month-old baby.

Mishaela Jaylynn Lockbeam-Wheeler, 20, remains in custody at the Yakima County jail on $1 million bail pending arraignment in Superior Court on June 24.

The case stems from the hospitalization of Lockbeam-Wheeler’s baby boy last Thursday.

Police said doctors at Yakima Valley Memorial Hospital performed a CT scan on the baby and determined the infant had two skull fractures.

The CT scan also showed the baby had suffered a subdural hematoma, or bleeding on the brain.

The baby was airlifted to Harborview Medical Center in Seattle, where doctors confirmed the head injuries and also found evidence of healing rib fractures.

According to police, Lockbeam-Wheeler told officers the baby had fallen off a futon couch while she was preparing a bottle.

Detectives got a search warrant for Lockbeam-Wheeler’s home in the 1800 block of Queen Avenue, and measured the distance from the couch to the floor at 13 inches.

Detectives also said Lockbeam-Wheeler’s parents told them their daughter had been alone with the baby when the injury occurred.

Capt. Rod Light, a spokesman for the Yakima Police Department, said Wednesday the baby is now out of the hospital and in the care of a foster family.

Under state sentencing guidelines, a conviction for second-degree assault charge carries a base first-time offender sentence of 31 to 41 months in prison.