Who are the 'left behind children' around the world?

The United Nations estimates that more than 900 million people globally move away for work, often leaving their children behind.

It is a big issue in China which has 61 million so called 'left behind children'.

Normally, grandparents or relatives raise the children, but despite family care they can still register feelings of abandonment.

Emily Buchanan looks at the facts and figures behind the global trend.

Video produced by Shan Ng