150 days after Raguna has married one of the bachelorettes, she will be holding a baby. There is no pregnancy event and the child looks the same no matter who the mother is. It will never grow older, and unlike traditional baby births, players cannot give it a name and its gender is never revealed. After the initial conversation, the baby can never be interacted with again.
At 150 days, this makes Rune Factory: A Fantasy Harvest Moon have the longest period of time to receive a child.