Children are the younger inhabitants of the kingdom in The Sims Medieval. Medieval children have several differences from the modern children of The Sims series.
Medieval children only have two ages: baby and child. A baby will grow into a child after one day, but a child will not grow any older except under certain circumstances (much like in The Sims 1). This is humorously referenced in the game, with a man complaining that his son is still a child after over 30 years.
Medieval children do not attend school and never die.
Children are largely unaffected by religion; adult Sims can praise the Watcher while interacting with children and children can attend sermons and watch Peteran evangelizing, but children cannot be converted by priests, prayed with, or the target of any buffs from priest abilities. It's unknown if children count as truly agnostic (and thus susceptible to the Carefree and Searching buffs) or if they simply experience no aspect of spirituality at all.
As babies, children will bestow a powerful buff to their parents (+80) until they grow up.
If a Sim socializes with their child long enough, they will receive a positive buff.
A Sim can have their children visit the town shop for them, saving the hero from having to go themselves. Note: The children of Hagglers will not get the discounts their parent receives, unless the child is also a Haggler.
A dead Hero Sim can be replaced by one of their children.
Mothers will have a higher starting relationship with their children than their fathers.
The traits of children are determined randomly, so if a child replaces their mother or father, this can not be customized. With that in mind, think carefully about which child should replace their parent.
However, calmer children may prefer a game of chess.