Koldingfjord’s original name was “Christmas Seal Sanatorium”. Postmaster Einar Holboll had the idea of selling Christmas seals so that rich and poor alike could contribute to helping weak and ill children. When people sent Christmas cards to one another, they gave two extra pennies for a Christmas seal that was then placed on the envelope next to the stamp. In this way, they helped to finance the construction of several sanatoriums. Koldingfjord was the first Christmas seal sanatorium to be built in Denmark. The sale of Christmas seals began in 1904 and brought in DKK 67,000. It was decided that the money would be used to build a sanatorium for children with tuberculosis. After a substantial amount of legal wrangling, a piece of property called Louisehoj in Kolding, and the adjacent hills, were purchased. The Christmas sanatorium was under construction from 1907-1911