It depends on who you marry. On YouTube type in "harvest moon ds children" and you should find a video that would help you.
They will have grayish hair.
these are the 3 stages of Muffy's child. baby, kiddie and teen.
If you marry the Witch Princess your child with have silver/gray hair and yellow eyes.
Your son will Have Blond Hair, and a white suit with some blue.
If you marry Leia or any of the "special" marriage candidates your child will end up as a random color out of the five possibilities. There is no set look for what her child looks like.
Yes all harvest moon u can get a child
It is random. There are five different coloring of children and you can have anyone of them if you marry Kai.
You can not have a child with Kai in Harvest Moon DS. But I'm guessing you're talking about Harvest Moon DS Cute, and yes you can have a child after you marry him.
Yes. In Harvest Moon DS you have to play as a male character and your child will always be male. In Harvest Moon DS Cute you can have a male or female child.
You can not give your child Toys on Harvest Moon For D.S. or D.S. Cute, But you can in Harvest Moon AWL and ANWL (I think ANWL)
Only one. Your child will look and act different depending on who you marry.
It would take you 2 seasons. Also, your child will always look like the same throughout, but would be considered as a grown child.