The stillborn child is also mentioned in "Making Time- Lillian Moller Gilbreth - A Life Beyond Cheaper By The Dozen" By Jane Lancaster, which I just finished (and which I highly recommend). According to the book, relatively shortly after Lillian received her doctorate from Brown, she fell down the stairs and went into labor. The child was stillborn, although according to the book, the fall was not the direct cause. Lancaster claims this was the reason that Lillian was in bed in the incident recounted in "Cheaper By The Dozen" when the children start asking where babies come from (rather than Lillian having a cold as claimed in "Cheaper"). The source of this information is not clear, as there is no attribution. In "Time Out for Happiness" Frank may have been protecting his mother and family's privacy as this was clearly a source of great pain for his mother, or possibly did not even know about the stillborn child (though I doubt it). Beyond the issue of the stillborn child, there are various conflicts regarding the facts as presented in the different versions of the Gilbreth story - for example, Lillian's traffic accident when she broke her nose, occurred several years later than indicated in "Belles on Their Toes" and she was in the family vehicle (which was being driven by a friend since she didn't drive) not in a taxi. However, most such conflicts are relatively minor and don't change the overall context or trajectory. My basic take on these conflicts is that "Cheaper" and "Belles" need to be viewed as entertaining accounts based on fact, but should not be viewed as absolutely historically accurate (and later comments from Frank, Jr. are clear that these books were written with some poetic license). "Time Out for Happiness" attempts to be more historically accurate (but has the plusses and minuses of being written by a non-objective family member), and the Jane Lancaster book is designed to be absolutely historically accurate. The various versions of events also need to be viewed as the end result of varying perceptions and memories of actual events, oftentimes many years after they occurred.