11.   Dr. Marjorie Barnett, a pediatrician in Silver Spring, Md., is accustomed to talking to parents about immunization.

12.   Families will be referred to the new specialists by their general pediatricians in most cases.

13.   For the last four years, Audrey has been treated by Dr. John Harding, a pediatrician in private practice.

14.   His father, Dr. Eric Chazen, is a pediatrician in Nashville and a clinical professor of pediatrics at Vanderbilt University Medical School.

15.   His pediatrician in the Bronx had heard about a headline-making operation being done at Johns Hopkins University in Baltimore.

16.   His mother, Sylvia, is a pediatrician in Washington, D.C., and his step-father, Holloway, a lawyer.

17.   His sister was a pediatrician in Fort Myers, Fla.

18.   One of the returnees was Dr. Helena Zymler-Svantesson, a pediatrician in Lund, Sweden.

19.   Still, pediatricians in this country remain cautious.

20.   That leaves parents and pediatricians in a quandary over whether to treat a fat child or leave the child alone.