Four years into the conflict in Syria, tens of thousands have been killed or wounded and it's having a truly devastating impact on the lives of the country's children. In this documentary, the BBC's chief international correspondent Lyse Doucet meets six young Syrian children and follows them over the course of six months, giving a significant but heartbreaking insight into the impact the war is having on them. Whatever outcome, this war will affect the future of this country for years to come.