More than 5,000 children in Yemen have been killed by the conflict since it started in March 2015, according to the United Nations task force in Yemen.
UNICEF representative to Yemen, Mertixell Relano, said the UN task force has reported 5,000 confirmed child deaths in Yemen since the conflict escalated in March 2015.
The war in Yemen has pitted the Iran-allied Houthi movement against a Saudi-led coalition, which intervened to reinstate Abdrabbu Mansour Hadi's internationally recognised government to power in Sanaa.
Yemen is facing the world's worst humanitarian crisis, where 8.3 million people are entirely dependent on external food aid.
Around 400,000 children suffer from severe acute malnutrition, a potentially lethal condition.
The Arab coalition, under international pressure, eased a three-week blockade that was imposed on Yemeni ports and airports in November in response to a ballistic missile fired by the Houthi movement toward the Saudi capital Riyadh.
More than 11 million Yemeni children need humanitarian assistance, Ms Relano said.
UNICEF figures show 25,000 Yemeni babies die at birth or before the age of one month.
The Yemen war has killed more than 10,000 people, ruined the economy and led to one million cases of cholera.