UN agencies are on "standby" to deliver needed assistance, Hanaa Singer of the UN's children agency told The Associated Press.
With the key powers deeply divided, the UN Security Council on yesterday once again failed to agree on the course of action in war-ravaged Aleppo, and Syria in general.
Russia vetoed a resolution drafted by France demanding an immediate halt to the bombing of Aleppo. A resolution put forward by Russia that called for a separation of moderate and extremist forces in Syria but making no mention of a bombing halt in Aleppo failed to get the minimum nine "yes" votes required for passage.
Conditions for thousands of displaced in the government-held part of the city are also deteriorating, with some of them being displaced for up to six times in the last three years, she said.
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Singer returned earlier this week from a week-long trip to the government-held part of Aleppo where she was visiting thousands of displaced Syrians.
In one case, a mother so desperate from the continuous displacement, stabbed her baby girl thinking she will save her the misery of living on handouts and without a home, Singer said.
Describing the dramatic situation for thousands of families living in shelters in government-controlled Aleppo, Singer said: "These (are) the horrors in western Aleppo. God knows what is happening, (in the case of) mental health or the psychological situation on the eastern (rebel-held) side."
Western Aleppo, controlled by the government, is separated from eastern rebel-held Aleppo by a few meters, sometimes by a single plastic sheet or pockmarked building. An estimated 275,000 people are living in the rebel-held part of Aleppo, with no international aid reaching the area since the first week of July.