Your problem might not be the milk so much as the vitamin D. Norway is so far north that you might not have enough sunlight to make adequate vitamin D. You need vitamin D to absorb the calcium in the milk, where calcium in vegetables is absorbed more readily.
Ichthyosis-en-Confetti Type 2
Husband, Nathan - 10, Elliot - 7, Oliver - 4, all affected.
I also have an unaffected daughter, age 8.
email: jennifer at confettiskin dot com
facebook - find me on "ichthyosis mommy spot" or "friends of ichthyosis"