BRUNSWICK — A Georgia teenager convicted of fatally shooting a baby in a stroller while trying to rob the child's mother was sentenced Thursday to life in prison without parole. De'Marquise Elkins, 18, was sentenced in Georgia's Glynn County Superior Court less than two weeks after a jury found him guilty of murder in the slaying of 13-month-old Antonio Santiago. The toddler was in his stroller and out for a walk with his mother when he was shot between the eyes March 21 in the Georgia coastal city of Brunswick.