Every year tens of thousands of children disappear in China; there are no official figures. Tan Jingjing’s son went missing after her divorce. She suspects her ex-husband sold the boy - then aged 18 months. He probably ended up being adopted, and is just one of countless similar cases. Children are bought and sold in China via online forums. Even where a child has been kidnapped and sold under a false identity, corrupt officials cover up the deal as an adoption. Tan Jingjing has spent the last three years looking for her son, who would now be five. Sold, but not Forgotten - Tan Jingjing Searches for Her Son A Report by Mathias Bölinger