January might seem an odd time to run a story about bicycle safety. While many kids received bicycles for Christmas, how many of them also found helmets under the tree? Children's Express talked with three kids who were injured in bike accidents about the accident, safety and helmets. They offer advice about what to do to make sure that bikers enjoy Christmas at home, and not in the hospital.

For more information about classes and locations, call (317) 355-4888 or write to 1500 North Ritter Avenue, Indianapolis, Ind. 46219. The Safe Sitter program, founded after a needless death, provides training in first aid, rescue breathing and children's behavior at various ages. A child needlessly dies because an adult baby sitter didn't recognize that the child was choking. The baby sitter

Gymnastics, Bela Karolyi says, "is a beautiful, challenging sport." Karolyi ought to know. He's coached Mary Lou Retton and Nadia Comaneci, and he'll be in Indianapolis in September to coach Kim Zmeskal in the World Gymnastics Championships _ the final qualifying competition for the 1992 Summer Olympics in Barcelona, Spain. The Romanian-born Karolyi also was in Indianapolis last month to hel