"We are seeing children in battle, at check-points and unfortunately among (those) killed and injured," Julien Harneis, UNICEF's representative in Yemen, told AFP during a stop in Geneva.
Staff of the United Nations children's agency and its partners had estimated that around 30 per cent of fighters in the armed groups were minors, he said.
In Yemen's tribal culture, it is common for boys to take up arms at a young age -- something that is having dire consequences amid the spiralling conflict.
Saudi-led forces launched air strikes last month as Shiite Huthi rebels advanced on Yemen's main southern city of Aden after seizing the capital.
President Abedrabbo Mansour Hadi fled Aden for Saudi Arabia during the Huthi advance and the city has since seen heavy clashes between pro- and anti-government forces.
Even when they are not on the front lines in the conflict, children are particularly vulnerable, Harneis said.
UNICEF has confirmed that 77 children have been killed and 44 others injured since March 26, the Franco-British national said, adding though that the true toll was likely far higher.
In addition to the violence, already high malnutrition levels in Yemen are expected to soar.
"We are going to see a spike in malnutrition in coming weeks. Unfortunately, that is something we are sure of," Harneis said.
"Difficulties in accessing water, rising prices for supplies, the difficulty to move around the country... All of this combined with cuts in state-run services (means) we will again see ... Hikes in malnutrition," he warned.
The conflict will also lead to a decline in the number of children attending school in a country where one million school-aged children were already not receiving an education, he said.
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