Four children in Pakistan's Punjab province have put up a banner outside their house that reads 'children for sale' in a bid to raise fund for their mother's kidney transplant.

Omar Illyas, son of 35-year-old Aqsa Parveen of Vehari town in Punjab province, said all valuables in their house had been sold and their only chance of saving their mother's life was to offer themselves now, the Express Tribune reported on Friday.