For the Children is related to the seasonal world event Children's Week. If you complete this achievement you will be rewarded with the title <Matron> or <Patron> depending on your character's gender. This achievement is also a criterion of the meta-achievement .
If your character's gender changes while showing the <Matron> or <Patron> title, your title will also change. This frequently happens to characters traveling around Icecrown or using morphs such as an .
The gender (and title) change also specifically happens to male characters entering Brunnhildar Village, where the Hyldnir are all female, and to female characters entering Netherwing Ledge where the Dragonmaw fel orcs are all male. On leaving these areas, your character's gender (and therefore, <Matron> or <Patron> title) will both revert to normal.