On a sweltering Chicago morning in 1933, a baby is delivered in a hatbox to the Century of Progress Exposition - the World's Fair. This very tiny baby, born 3 months early, is brought to the fair's famous baby doctor, Leo Hoffman, to be saved. Dr. Hoffman - part showman, part scientist - finances his neonatal research by exhibiting a collection of live premature babies. His "Infantorium" attracts huge, gawking crowds every sultry day. At the fair - a place of freaks and marvels, mysteries and miracles - the notion of what is "normal" comes into question daily. Before the summer ends, a number of remarkable persons will invest heavily in this fragile baby's life.