(Forest Grove, OR)  --  A man is facing charges after being accused of assaulting his girlfriend's three-year-old son.  Forest Grove police say the toddler is listed in serious condition after being found unconscious at a local residence Monday.  Authorities say 30-year-old Wesley Allen Steagall already had a warrant out for his arrest when he was taken into custody.  The boy's injuries are considered potentially life-threatening.