At least 1,000 children have been killed across Syria so far this year, said Christophe Boulierac of the United Nations Children's Fund (UNICEF).
He said that living underground has become the norm in the besieged rebel-held enclave of eastern Ghouta where 400,000 people live.
The UN said that it planned to send another aid convoy to eastern Ghouta on Thursday, after 14 of 46 trucks were unable to fully unload on Monday due to shelling on the town of Douma.
"After nearly nine hours inside, the decision was made to leave for security reasons and to avoid jeopardizing the safety of humanitarian teams on the ground," Jens Laerke of the UN Office for the Coordination of Humanitarian Affairs (OCHA) told a news briefing on Tuesday.
Death toll in Syria’s Ghouta rises to 84, women, children among victimsAir strikes in Syria’s Eastern Ghouta have killed 23 individuals, five of which are children, reported the Syrian Observatory on Wednesday ... Middle East
Eight children among 21 killed in Syria strikesAir strikes by regime and Russian aircraft on rebel positions in the northwestern province of Idlib killed at least 21 civilians, including eight ... Middle East
Four children among 28 civilians dead in air strikes on Syria safe zoneAt least 28 civilians were killed in air strikes on northwestern Syria where a planned safe zone has been overshadowed by a bombing campaign against ... Middle East
UNICEF: More than 40,000 children at risk in Syria’s RaqqaThe United Nation’s children agency is warning that the fight for the ISIS group’s stronghold of Raqqa in northern Syria is threatening ... Middle East