"All children in Aleppo are suffering. All are traumatised," Radoslaw Rzehak, UNICEF's field office head in Aleppo, told AFP inside the devastated city yesterday.
"I have never seen in my life such a dramatic situation (as) what is happening to children in Aleppo," said Rzehak, who has been working for UNICEF for the past 15 years.
Tens of thousands of children in Syria's northern city have borne witness to one of the bloodiest phases of the country's nearly six-year war.
The city's east had been a rebel stronghold since mid-2012, but government forces in recent weeks have overrun more than 85 percent of that area.
More From This Section
An estimated 120,000 people have fled the city's east, many heading towards displacement centres in government-controlled areas to the west.
Rzehak said preliminary psycho-social assessments at these centres showed children from east Aleppo were "losing their basic instinct of defence."
"Some of the children who are five, six years old, they were born during a time when war was already happening. All they know is war and bombing," he said.
He said this was putting children at risk, as they have not been conditioned to take cover or hide during bombardment.
"For them, this is not danger. This is every day life."
West Aleppo's children, meanwhile, had been severely impacted by seeing classmates or teachers killed in rocket attacks on their schools.
"The place that was the most secure for children became the place where they die," Rzehak said.
"It's very difficult to blame them. They also went through the nightmare," Rzehak said.
More than 300,000 people have been killed since Syria's conflict erupted in March 2011, and millions more have been forced to flee their homes.