Description. Sims 4 Children Rules. Must be on a lot 30 by 30 are 40 by 30. 2.Life span must be 'normal'. The mother must have following this with traits. either ''Successful Lineage are ''Big happy Family and the romantic trait. Must have maternity clothes as one of the set of everyday wear. You must ask to be boyfriend/girlfriend with the baby daddy then break up after the baby is born you only can have 2 babies with the same man. |--| 6. When your building your home you able to use.