Emma gives birth to Joseph III. [Joseph Smith III] was born in a house put up for his father on Isaac Morley's farm. His mother had hard labor and the blood went to her head which became black. The prophet became frightened and sent to Willoughby for Dr. Card, and told the messenger to run his horse. The doctor came and bled her and delivered the son.
[Source: Kenney, Scott, Saints Without Halos, "Mormon History 1830-1844," http://web.archive.org/web/20120805163534/saintswithouthalos.com/dirs/d_c.phtml]