It was a big night for Sandy Duncan Sunday when the Broadway run of "My One and Only" closed. Duncan's husband, Don Correia, wasn't able to be there for the end of the run because he and baby Michael, 11 months old, were in Washington setting up a house where the family will live during the run of the show here.

Duncan's eldest son, Jeff, 2, as he frequently does, watched the show from the wings. There are numbers he especially likes and he was there to see his mother and costar Tommy Tune do his favorite, " 'S Wonderful." Then at the final curtain call, he made his stage debut by bringing out roses to his mother.

During the March 8 through April 14 Kennedy Center run, Duncan's dressing room, like the one she had at the St. James Theater, will double as a nursery. It will include a playpen, a crib, a small table-and-chairs set with puzzles, crayons, finger paint and, of course, greasepaint and a ready supply of peanut butter and jelly. With Correia in rehearsals in New York for the Gene Kelly role in the upcoming Broadway production of "Singin' in the Rain," the family will be traveling back and forth on days off. Duncan said she is delighted about playing the Kennedy Center because there is so much more room for Jeff to run around.