"If funding is not received immediately, UNICEF will have to suspend essential life-saving health services within one month," spokesman Christophe Boulierac said.
UNICEF, which has been providing 70 per cent of all health services in Somalia, has so far received just 10 per cent of the USD 150 million it needs for its activities in the country this year, he said.
The lack of funding is dramatic, amid warnings that the troubled country, which was hit by an extreme famine less than three years ago, could be sliding back into a food crisis.
Somalia was the hardest hit by extreme drought in 2011 that affected over 13 million people across the Horn of Africa, with famine zones declared in large parts of the war-ravaged south.
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Some 250,000 people, around half of them young children, died in Somalia during that famine, according to the UN, which has warned that poor rains and conflict could be paving the way for a new food emergency.
"Today we have an early warning, with the ingredients of a perfect storm for a humanitarian crisis," Andrew Lanyon, head of the Somalia Resilience Programme, a coalition of aid agencies, said earlier this month.
Around 280,000 pregnant women would also lose access to antenatal check-ups, Boulierac told reporters in Geneva.
The UN's World Food Programme, which in April distributed food to 664,495 people in Somalia, has also warned it has been forced to lay of staff and reduce aid because of a shortfall in funds.