Jose Rivera Salvador pleaded no contest in November to the April 20, 2007, attack at the SamTrans Sequoia Station bus stop, Assistant District Attorney Karen Guidotti said.
Clutching a rock the size of a softball, Salvador approached the mother and her 18-month-old son and, without warning, began hitting the child in the head with the rock, Chief Deputy District Attorney Steve Wagstaffe said.
He then dropped the rock and walked away, according to Wagstaffe.
Transit officers located Salvador in a nearby parking lot.
Wagstaffe said he appeared to be suffering from mental problems. The toddler was taken to a hospital and received extensive suturing, Wagstaffe said.
Salvador was charged with assault with a deadly weapon, battery with serious bodily injury, cruelty to a child and inflicting injury upon a child, Guidotti said. He later pleaded no contest to the charge of inflicting injury upon a child.
