SAN DIEGO -- A young man who beat his 4-month-old son, leaving the child with permanent brain injuries and cerebral palsy, was sentenced today to 35 years in state prison.

Jordan Jackson, 20, pleaded guilty last month to mayhem and three counts of felony child abuse, including allegations that he personally inflicted great bodily injury on his son, Jeremiah.

Jackson admitted abusing his son in a locked bedroom at his mother's house on July 31, 2011, leaving the victim with bleeding on the brain, broken arms and legs and a broken clavicle.

The child -- now 18 months old -- needs constant care, is essentially blind and cannot stand, sit, walk or speak, and has a seizures every day, according to his foster mother, Joyce.

"For all the damage you've done to Jeremiah, may God forgive you Jordan,'' the foster mother told the defendant.

Superior Court Judge Frederic Link told the defendant he would "never be forgiven'' for what he did to a helpless child.

"This sentence is too good for you,'' Link told Jackson. "As far as I'm concerned, you should be taken out and beaten severely. You basically killed him (Jeremiah) now.''

Jackson apologized for his actions, saying the stress of having no job and no money for marijuana got to him on the day he injured his son. The defendant said the baby had been crying all day when he lashed out and beat him.

The boy's biological mother, Amy Quinones, pleaded guilty to felony child abuse for failing to call 911 after the child was injured.

Quinones, then 18, served about nine months in jail before being released.

Thursday in court, Quinones spoke on behalf of her son, who sat nearby in a stroller/wheelchair.

"I thought you would be a good dad, but you turned around and hurt me,'' Quinones said, speaking for her son.