In a moving new video released by War Child, a group of celebrities tell the true story of a Syrian teen forced to flee across the border, and the tragic events that follow.
War Child has launched the Enough Is Enough campaign to end the targeting of children in war.
On average, one child has been killed every hour since the war in Syria began.
Right now, 400,000 are living under siege – with restricted access to food, water and medical supplies.
Some 2.3m children are now refugees as a result of the war.
More than 1,000 children have been killed in Yemen since the war began there nearly two years ago.
The situation there is desperate; over 10 million children need urgent assistance and some 460,000 face severe malnutrition.
To find out more about the campaign, click here.