A total of almost 50,000 kids are believed to have perished from such causes during 2017, with a similar number expected this year, according to Save the Children and the U.N.
Save the Children spokesman Bhanu Bhatnagar called the situation in Yemen "a stain on the world’s conscience."
UNICEF's operation in Yemen estimates there are 1.8 million children currently facing malnutrition, including 400,000 who are severely malnourished and at risk of death if not urgently treated. More than 8 million children are cut off from regular access to basic water, sanitation and hygiene services.
Bhatnagar says the fighting that is raging in Yemen is killing an "entire generation of children," who are bearing the brunt of the violence.
"Thousands are so malnourished they don’t even have the energy to cry," he said.
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U.N. is assessing whether the crisis in Yemen can officially be declared a famine, with initial results expected next month.
"An official famine declaration would only confirm what we already know: Children are already dying from starvation," said Frank McManus, the International Rescue Committee's country director in Yemen. "Famine, by definition, means it’s too late.”
The conflict in Yemen began with the 2014 takeover of the capital, Sanaa, by Iran-backed Houthi rebels, who toppled the internationally recognized government. A Saudi-led coalition allied with the government has been fighting the Houthis since 2015.
The fighting has left 6,800 civilians dead and more than 10,000 injured, sparking the world's worst humanitarian crisis. Yemen's gross domestic product has been cut in half since 2015, with more than 600,000 jobs lost and a least 80 percent of the population living below the poverty line, according to U.N. numbers.
"It’s astounding that today, the international community can sit on its hands and, in fact, allow and facilitate this famine," said Oxfam's Richard Stanforth.
The independent Yemen Data Project has tracked the number of air raids since the start of the war — more than 18,000 since spring of 2015.
Save the Children says that means a child in Yemen who was born as the conflict broke out has lived through an average of about 14 air raids per day.
“Yemen is one of the most dangerous places in the world to be a child today,” said Bhatnagar. “The ongoing brutality means children are being consistently exposed to extreme violence, further heightening the risk of psychological damage.”
In August, dozens of Yemeni children were killed in a Saudi-led coalition airstrike on a bus in northern Yemen, one of the deadliest attacks on civilians in the three-year-old war.
The U.N. has said that all parties in the conflict have been responsible for attacks on civilians, underscoring how targets have included homes, medical facilities, schools, farms and weddings.
The people of Yemen "live under fear of continuous bombardment," said McManus, of the International Rescue Committee. "Despite almost four years of airstrikes and use of heavy weapons, neither side is any closer to achieving their strategic objectives."