Fifty-six children were also among the 79 people wounded in the August 9 strike on Saada province, a rebel stronghold that borders Saudi Arabia, according to the International Committee of the Red Cross.
The coalition has promised an internal inquiry but analysts and aid groups have voiced doubt that it is ready to provide the transparency and accountability demanded by the wider international community.
It is part of the world's worst humanitarian crisis, a conflict that has killed nearly 10,000 people since the Saudi-led coalition intervened in Yemen in March 2015 as Huthi rebel fighters closed in on the last bastion of President Abedrabbo Mansour Hadi's government.
Coalition commanders have admitted a small number of mistakes, but there has been no public disciplinary action or changes to the rules of engagement.
The commanders have accused rebels of using civilians as human shields.