(Edwardsville, IL)  —  A search continues to find the 13-year-old girl and her newborn son who went missing from Edwardsville.  State Police say Katherine Derleth and her child disappeared over the weekend.  Investigators believe Christopher Derleth, the girl’s stepfather, may have taken the children to West Virginia.  A warrant has been issued for his arrest on charges of aggravated kidnapping and child abduction.