In an overcrowded nutrition clinic at Alsalkhana hospital in Hodeidah, one of Yemen’s largest cities, around 30 anxious mothers wait with resigned patience to have their children weighed and measured.

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The first thing you notice about Ayesha*, aged seven months, is her stick-thin legs and distended tummy. She weighs just 3.5kg – the average weight of a newborn baby in the UK. When the doctor measures her upper-arm circumference, the tape goes deep into the red zone, indicating dangerous malnutrition.

This is not Ayesha’s first brush with starvation. Two months ago, she spent five days in the hospital’s emergency stabilisation centre for severely malnourished children. Her life was saved – just. Now she is back in Save the Children’s emergency feeding programme, along with two of her sisters, aged two and three years old. “I just don’t have the money to feed them or buy medicines; what can I do?” her mother, Amina*, asks me.

Sometimes the war in Yemen kills very visibly. Over 5,000 children have lost their lives or have been wounded by military action since 2015. Some have been the victims of bombs, some of which were manufactured in the UK, that have hit schools, homes and public places. Others have been caught in indiscriminate crossfire across the jigsaw of frontlines that define Yemen’s war. That war pitches the Houthis, who control the capital, Sana’a, against groups backed by a Saudi-led coalition of nations.

It’s not just bombs, bullets and artillery shells that threaten Yemen’s children. This is a conflict that also kills by stealth. Economic strangulation is being used by the Saudi-led coalition as a weapon of war, targeting jobs, infrastructure, food markets and the provision of basic services. Nobody is there to count the bodies of the victims. But for every child buried beneath the rubble of a building hit by a “smart bomb”, there are dozens of children – like Ayesha – threatened by the starvation that has accompanied the economic assault.

The UN has described Yemen as “the world’s worst humanitarian disaster”. Almost two-thirds of the population need emergency support. The food system is collapsing, pushing the country to the brink of famine. Over 400,000 children are at imminent risk of starvation. Unlike Ayesha, most of them will never see a health clinic or receive treatment. Many of those who survive will be affected by stunting and poor health for the rest of their lives.

Jobs, economic infrastructure, and basic services have been systematically targeted by acts of war

Economic collapse has been the catalyst for economic crisis. Jobs, economic infrastructure and basic services have been systematically targeted by acts of war. Coalition airstrikes have targeted warehouses, factories and – critically – transport infrastructure. The economic assault has trapped millions of Yemenis in a vicious spiral of rising food and fuel prices, unemployment and declining wages.

The road from Sana’a to the port of Hodeidah, one of Yemen’s main arteries, bears the scars of economic warfare. Making the journey last week, I counted three bridges destroyed by Saudi airstrikes. The port itself is a ghost town. Saudi bombs have destroyed the five cranes that once unloaded ships carrying 80% of Yemen’s imports, along with grain storage silos. Over 20,000 people have lost their jobs. One of them is Ayesha’s father, which is why a family with five children is now living on less than $3 (£2) a day.

Economic collapse has been compounded by the collapse of the banking system. In 2016, Saudi authorities transferred the central bank from Sana’a to the southern city of Aden, which is controlled by its allies. The move effectively pulled the plug on public financing in northern governates under Houthi control, leaving more than 1.5 million health workers, teachers and water and sanitation workers without pay; and schools, hospitals and other basic services without budgets.

Facebook Twitter Pinterest Baby Ayesha being measured at Alsalkhana hospital in Hodeidah. Photograph: Kevin Watkins

You can see the consequences at the general hospital in Amran. This is the main referral hospital, serving a population of over a million people. It has no antibiotics, no anaesthetics, and no drugs for obstetric emergencies. The hospital covers its costs by charging patients, who have to purchase their own drugs from private providers. Try imagining your nearest teaching hospital in the UK operating without the medicines you can get prescribed by any GP.

True, the Saudi-led coalition allows a small amount of food, fuel and medicine to enter northern Yemen through Hodeidah. But this is little more than a humanitarian gesture aimed at maintaining the inaction of western allies. It is economic strangulation and war that is driving the country towards a manmade famine. Many more Yemeni children are dying every day from lack of food, medicine and clean water than from fighting.

The international community has responded to Yemen’s crisis by pledging humanitarian aid. Earlier this month, donors committed $2bn of the $3bn requested by the UN for 2018. Ironically, the Saudi-led coalition countries were the biggest contributors, effectively paying for humanitarian sticking plasters while causing an economic haemorrhage.

Humanitarian aid is vital – but it is not enough. Western countries, including the UK, could – and should – be doing far more to broker a peace agreement. They should also hold Saudi Arabia and other members of the coalition accountable for potential war crimes and violations of humanitarian law. Marking the visit of Crown Prince Mohammed Bin Salman to London with the sale of 48 advanced fighter jets sends the wrong signals, and comes dangerously close to collusion.

Yemen also desperately needs international support for an anti-famine strategy. That strategy has to go beyond delivering emergency supplies to restoring food markets, reconstructing infrastructure and financing the salaries of public workers. The World Bank could play a critical role in these areas. With epidemics of cholera and diphtheria in prospect, donors also need to step up investments in clean water and health.

None of this will work without an end to the economic strangulation that almost killed Ayesha, and is killing many children like her. Yemen’s children did not cause this war – but they are dying because of our failure to protect them.

*Interviewee names have been changed

• Kevin Watkins is chief executive of Save the Children UK