An Oak Harbor man was arrested after his 3-month-old son was admitted into Seattle Children’s Hospital and doctors found multiple fractures on his legs, ribs and arm that were in various stages of healing, according to court documents.

Prosecutors charged 21-year-old Alexander J. Pinzon, an active duty member of the Navy, in Island County Superior Court Nov. 22 with assault of a child in the first degree. Prosecutors allege that it was a crime of domestic violence as well as a charge with an aggravating circumstance, which is that the child was particularly vulnerable.

A report by a detective with the Island County Sheriff’s Office states that CPS alerted the police in October that a child at the Children’s Hospital suffered from bruising and swelling on his lower extremities and multiple fractures on his limbs and ribs. CPS reported that the parents did not know how the injuries occurred, the report states.

The injured child had been flown by helicopter from WhidbeyHealth to Children’s Hospital for treatment.

Both of the baby’s legs were placed in leg casts. Both legs had fractures in various stages of healing. Doctors said that the injuries could not be accidental because of the baby’s age and his inability to move around much.

In an interview with police, Pinzon said he something plays rough with the child. He said sometimes he plays with the baby by yanking him by both legs and sometimes he “did it too hard,” the report states. He admitted to twice grabbing the baby by the legs and swinging him to the side when he was frustrated that the child wouldn’t calm down, the report states.

If convicted of the crime, Pinzon could face up to 10 years and three months in prison under the standard sentencing range, plus an aggravating circumstance, if found, could allow a sentence beyond the standard range.

The baby was placed in foster care and the parents have supervised treatment at CPS.