Yes, once your child is at its oldest stage (it can help you on the farm), you can go create a "Journey Rucksack" from the tailor shop, which will basically start the game over with your kid as the main character
Only when ripe
click on the link it should lead you right to them.
you finish all the rainbows to resurrect the new tree and the harvest goddess comes back then its over.
you can get it at praline woods next to dale's carpentry and the blacksmith shop
two months after you get married your character or your wife will feel ill and it turns out you or she is pregnant and two months after that she will have a baby
Three seasons after being married.
You just have to wait until your child is older.
three seasons to become young child
Once your character dies, it will do it automatially.
Not A child,but YOUR child can help. After they are like a year old,they can help.
A year after they are born
talk to it every single day