Is Marilyn Monroe lost her baby during the film some like it hot?

There is no record of Marilyn Monroe losing a baby during the filming of "Some Like It Hot".

While Marilyn Monroe did experience several miscarriages throughout her life, these events did not occur during the production of this film.

It's possible that you may be confusing this information with another event in her life, or perhaps there is a rumor circulating that is not based on factual information.