The children are said to have been recruited by the Huthi rebels and according to the UN report, up to 2,000 children lost their lives in battle between January 2020 and May 2021.
"They were between the ages of 10 and 17," said UN experts who wrote the report.
According to the report, there are still camps and schools where the rebels teach children to soldiers.
"In a camp, children as young as seven years old learned to clean weapons and avoid rockets," the report says.
Need for vulnerable emergency
The UN states that in several cases it has been seen how children who thought they should be allowed to participate in various cultural activities have since been taken away to fight and where assistance to families in need has been conditioned by the children participating as soldiers in the ongoing conflict.
The need for international support for the vulnerable and affected in the country is urgent, but relief efforts are difficult to achieve.
The war in Yemen, which is at the tip of the Arabian Peninsula, has been going on since 2014, with Iranian-backed Huthi rebels fighting an internationally recognized government backed by a Saudi-led coalition.