The landlocked Himalayan nation has been struggling to cope with a sharp drop in vital supplies after protesters on September 24 began blockading a key border crossing to demand changes to a new constitution.
Nepal's government accuses neighbouring India of orchestrating the blockade, a charge it denies.
The disruption has caused crippling shortages of fuel and medicine, leaving aid organisations scrambling to deliver relief to homeless quake victims seven months after the April 25 disaster killed nearly 9,000 people.
More than 200,000 families are still living in temporary shelters at an altitude above 1,500 metres, it said.
"The risks of hypothermia and malnutrition, and the shortfall in life-saving medicines and vaccines, could be a potentially deadly combination for children this winter," said Anthony Lake, UNICEF's executive director.
"They could now be facing a new disaster -- without adequate food, protection from the cold, or health care."
"The plight that children and their families are facing in the country has been worsening by the day and will deteriorate further in the winter months," said Karin Hulshof, regional director of UNICEF for South Asia.
"UNICEF urges all sides to address the restrictions on essential imports of supplies to Nepal. There is no time to lose," Hulshof said.
Scores of trucks have been stranded at the Birgunj border checkpoint in southern Nepal, where protesters from the Madhesi ethnic minority have blocked a bridge for over two months.
New Delhi has denied the charge and urged dialogue with the Madhesis, who share close cultural, linguistic and family links with Indians living across the border.
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