This week marks two years since the crisis in Syria began. Over one and a half million Syrian refugees have now fled across the border - half of them children – and the numbers show no sign of slowing.
In Syria itself, a further three million children are in urgent need of humanitarian assistance.
The scale of the crisis facing Syria's children requires a massive response. UNICEF is working in Syria and in five neighbouring countries (Jordan, Lebanon, Turkey, Iraq and Egypt) providing children with safe drinking water, essential vaccines and nutrition, education, clothing and protection.
However, a chronic lack of funding is threatening to leave many Syrian children without essential help. Unless that issue is solved, UNICEF will be forced to scale back on even life-saving interventions.
"It is clear that the situation is now critical," said David Bull, UNICEF UK Executive Director, speaking from Za'atari refugee camp in Jordan.
For example, as of next month, we might not have enough funds to provide children and their families in Syria with clean drinking water. Without this, millions of children could be exposed to potentially life-threatening waterborne diseases.