http://en.wikipedia.org/wiki/Stachybotrys#Species
http://en.wikipedia.org/wiki/Stachybotrys_chartarum
So I would guess, if the child already had an asthmatic condition, then yeah, it could affect the child while not really bothering the adults who were actually sleeping in the room as the Black Mold here is not of the "Toxic" variety.Originally, toxic effects from mold were thought to be the result of exposure to the mycotoxins of some mold species, such as Stachybotrys chartarum. However, studies are suggesting that the so-called toxic effects are actually the result of chronic activation of the immune system, leading to chronic inflammation.[citation needed] Studies indicate that up to 25% of the population have the genetic capability of experiencing chronic inflammation to mold exposure, but only 2% actually experience such symptoms.
http://en.wikipedia.org/wiki/Mold_health_issues