20-year old Errol Harrell is being held in the Elmore County Jail.
Harrell is charged with capital murder in the beating death of his two-week old son.
Isaiah Harrell, born August 18th, was pronounced dead Saturday at the Elmore County Hospital.
Initially, Harrell claimed the baby had fallen off the bed, but the sheriff says Harrell later admitted striking the baby several times in the face to stop his crying.
An autopsy found the baby's left eye socket was collapsed and his nasal cavity had been crushed.
Police say the child's 16-year old mother left the baby in Harrell's care.
Harrell is being held with out bond.