"With no sign of a let-up in the extreme cold weather and storms sweeping Central, Eastern and Southern Europe, refugee and migrant children are threatened by respiratory and other serious illnesses -- and even death from hypothermia," UNICEF said in a statement.
An estimated 23,700 migrant and refugee children, including infants and newborns, remain stranded in Greece and the Balkans, where temperatures in some parts have plunged below minus 20 degrees Celsius.
"Infants and the very young generally have less body fat to insulate them against the cold, making them more susceptible to respiratory problems and potentially fatal viral and bacterial infections such as pneumonia and influenza," said Basil Rodriques, UNICEF Regional Health Advisor for Central and Eastern Europe, in a statement.
The total number of deaths across Europe from the frigid weather jumped to over 60 adults in just a few days, with many of the victims being migrants or homeless people.
But many of these shelters "are ill-equipped for winter, even as temperatures fall below freezing," UNICEF said.