I am from Nigeria and there has been a problem with child marriage in some places and people are fighting back against it hard and all. However someone there said they believe its fine for very young girls 9-10 to be married and have kids if they hit puberty and are developed or finished with it. They said some girls look older at that age and its fine then.
I don't think that's true as science has shown very young pregnancies are harmful. Someone replied if a 9 year old has a 15 year old body they are biologically older and its not harmful.
Are there hard facts showing very young pregnancies are harmful?