I heard a news story about this on the BBC earlier today.
And was shocked to hear that to put it bluntly the parents of a girl can agree to her getting married if a judge (I think) rubber stamps it.
The child does not have a voice.
Scary and upsetting personal story from a young woman at 12 (?) being married to a man many years older than her.
And campaigners are trying to make this illegal but ACLU think this shouldn't happen.
I cant find a written version so this is linked to a podcast https://www.bbc.co.uk/sounds/play/p0mtds6z
( all the ?s are because I am relying on my memory of what I heard. Also cant remember the name of the campaign group who are active.)