Can nine year old kids have babies?

Generally, no, but there have been children who did. The youngest to have a child was a little girl in South America who was 7. To have a child at such a young age a child would have to go through puberty first. Not many children do enter puberty at such a young age. The average age is 11 or 12. A child having sex at any age younger than 18 is sexual abuse and is against the law.