When John Hajdu was three, his parents gave him a teddy bear small enough to fit into his hands: 86 years later, it is the only surviving object from his childhood.The bear, which the 89-year-old simply calls “teddy”, stayed with him as his father was taken to a labour camp, his mother sent to a concentration camp, and he hid in a non-Jewish neighbour’s cupboard before being forced into the Budapest ghetto.From 31 July, teddy will go on public display for the first time as part of Childhood in War, a new exhibition at the Imperial War Museum, London, examining...