It added that it is "deeply shocked and saddened" by the attack.
Worldwide rights groups have accused the Saudi-led coalition of bombing civilian gatherings, markets, hospitals, and residential areas across Yemen since the beginning of its campaign against Houthi rebels in 2015.
"The people of Yemen are being subjected to deprivation, disease, and death as the world watches", Stephen O'Brien, the United Nations under secretary general for humanitarian affairs and emergency relief coordinator, said in a recent speech to the UN Security Council.
Earlier, the officials said the family was fleeing from the fighting raging in the province.
The bombing was part of an air campaign being carried out by the Saudi-led coalition since March 2015.
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"[Children] are facing threats from all sides, they've got the threat of airstrikes from above, which are continuous - just in the past few weeks we've seen [bombs] landing on marketplaces where civilians have been killed", Caroline Anning, senior conflict and humanitarian advocacy adviser at Save the Children, said to the Guardian. However, they "continue to be exposed to danger as the conflict has affected all of Yemen's mainland governorates", UNHCR said in its statement Tuesday.
Save the Children has warned that if the United Nations fails to include Saudi-led coalition on this year's list, it will set a unsafe precedent for other conflicts around the world.
The impoverished Arab country has been devastated by the war, which has killed more than 10,000 people and displaced more than 3 million. It accuses the rebels of using civilians as human shields.
Repeated attempts to bring about a political solution to the conflict, including a series of UN-mediated peace talks, have failed.
The coalition has imposed an air embargo on areas controlled by Huthi rebels and their allies, former troops loyal to ex-president Ali Abdullah Saleh - including Sanaa.