Authorities say an infant boy was killed in a traffic crash near Siloam Springs. Joshua Blake DeMoss died Tuesday in a single-vehicle crash. Police say the infant was in a safety seat. He was almost five months old. Police say the boy`s mother, 19-year-old Felica M- DeMoss drover her small pickup truck off the road and hit a utility pole. The pole broke, and fell on the passenger side where the baby was. A two-year-old child in the truck was not injured.