Scandinavian Wildlife Park manager Frank Vigh-Larsen says Siku is doing "really fine." The cub now weighs 7 pounds - against 3 pounds at birth.
Vigh-Larsen said Thursday that the cub was two days old when he was removed from his mother after surveillance video inside the bear cave revealed that he "was moaning and being unruly all the time."
Vigh-Larsen says Siku would have been in danger of death if he had stayed with his mother.
Three people are giving round-the-clock care to the cub at the zoo in Kolind, 105 miles northwest of Copenhagen.
