Telco WorldCom's widely-anticipated bankruptcy filing, the biggest to date, had less impact than dismal results from a 'Baby Bell.' BellSouth, which serves consumers from Kentucky to Florida as America's third biggest local telephone service provider, plunged $5 or 18% to $22.61 after it said its business was weak and could remain so. Other telcos were buffeted in BellSouth's wake, with SBC sliding $2.72 or 10% to $23.96.