Latest figures underscore need to address global humanitarian crises affecting vulnerable youngsters, says UNICEF.
War and poverty have forced 50 million children around the world from their homes, according to UNICEF.
Up to 28 million of the children have been uprooted by violent conflict, with nearly as many abandoning their homes in search of a better life, says a report released by the UN agency.
The report, entitled Uprooted: The Growing Crisis for Refugee and Migrant Children, also says that the number of child refugees has more than doubled in the past 10 years from four million to 8.2 million.
UNICEF describes the children as some of the most vulnerable people on earth and gives warning that if governments do not act, the numbers are likely to grow.
Whether it is from war, violence, poverty or climate change, the youngsters have been uprooted by crises they are not responsible for, or have little influence over, says UNICEF.
The report, published on Tuesday, says that children make up about a third of the world’s population as of 2015 and accounted for nearly half of all refugees.
Speaking in Geneva, Ted Chaiban, UNICEF director of programmes, said: "What’s important is that these children on the move are children. And they should be treated as children.
"They deserve to be protected. They need access to services, such as education."
According to the report, there were 10 million child refugees and one million child asylum seekers whose status had not yet been determined.
The remaining 17 million children displaced by conflict remained within their home countries’ borders.
The report said 45 percent of the children refugees came from just two countries, Syria and Afghanistan.
Increasingly, these children are travelling alone, with 100,000 unaccompanied minors applying for asylum in 78 countries in 2015, three times the number in 2014, the report found.
Because these children often lack documents, they are especially vulnerable.
The report estimates another 20 million children are migrants, driven from their homes by poverty and gang violence among other things.
Refugee and migrant children face a host of risks including drowning during sea crossings, malnourishment, dehydration, kidnapping, rape and murder.
When they arrive in other countries they often face discrimination and xenophobia, the report stated.
"The world hears the stories of child refugees one child at a time and the world is able to bring support to that child, but when we talk about millions it provokes incredible outrage and underscores the need to address the growing problem," said Emily Garin, the UNICEF report’s author.
The report calls on the international community to provide protection, education and health services to these children and asks governments to address the root causes contributing to the large-scale movements of refugees and migrants.
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