At least 10 more women were wounded, medical sources said.
A Houthi rebel spokesman said the strike was followed by a second which hit emergency responders in Arhab, 40km (25 miles) from Sanaa.
The rebels blamed a US and Saudi-backed coalition for the bloodshed, who are yet to comment.
The coalition has been fighting the Houthis and forces loyal to a former Yemeni president, Ali Abdullah Saleh, since March 2015.
Its aim is to restore the internationally recognised government of President Abdrabbuh Mansour Hadi.
Abdel-Rahman al-Ahnomi, a spokesman for the Houthis, said the twin strikes killed and wounded dozens of people.
However, other reports from the scene said there was only one air strike. Conflicting reports are common in the chaos following air raids in Yemen.
Yemen's war has killed more than 10,000 civilians and displaced more than three million people since 2015.
The conflict and a blockade imposed by the Saudi-led coalition have also triggered a humanitarian disaster, leaving 80% of the population in need of aid.
Doctors Without Borders warned this week of a worsening situation in the city of Taiz, where hospitals have been repeatedly attacked and where 200,000 people face food, water and medicine shortages.
The US was criticised last month over a raid on a village in central Yemen, in which a number of civilians died - many of them children. Its target was the house of a suspected leader of al-Qaeda in the Arabian Peninsula (AQAP).
US media now report that the dead included a tribal leader allied to the internationally-backed president.
A US Navy Seal was also killed in the attack, and six American soldiers were wounded.

The Scottish comedian and actor started out as a folk singer before developing his stand-up act.
The 72-year-old often travelled with his banjo but now says he can no longer play as he prepares to travel across the US by rail for a new TV series.
Connolly said Parkinson's had particularly affected the use of his left hand.
When he was on Desert Island Discs, Connolly chose a banjo as his luxury item and he also has a banjo tattoo on his left hand.
In an interview in Canada to promote his stand-up tour, he said: "I'm starting a documentary series in a month's time following the railways around America. I'm going to festivals and state fairs and all that.
"I've been longing to do it for a long time. The only trouble is that we're going to bluegrass festivals and I've got Parkinson's Disease and it's really affected my left hand and I can't play the banjo or guitar any more, but I'll join in on the singing at least.
"It's been a rough go between that and the cancer. I kept telling my wife that haemorrhoids couldn't be far behind."
Connolly disclosed in 2013 that he had been diagnosed with Parkinson's and prostate cancer on the same day.
He has since been given the all-clear from cancer and will travel through 28 states and 8,000 miles by train later this year in new ITV documentary series Billy Connolly's Tracks Across America.
Eight women and a child have reportedly been killed in an overnight air raid on a funeral reception near Yemen's rebel-held capital, Sanaa.
[NEXT_CONCEPT]
Billy Connolly has been forced to give up playing the banjo and guitar because of Parkinson's Disease.