WHAT IS CHILD MARRIAGE? Child, early or forced marriage or unions are a violation of children’s human rights. Despite being prohibited by international law, it continues to rob millions of girls under 18 around the world of their childhood. Early marriage is a harmful practice that denies girls their right to make vital decisions about their sexual health and well-being. It forces them out of education and into a life of poor prospects, with an increased risk of violence, abuse, ill health or early death.