VIDEO: Baby Polar Bear Cub Nursed by Humans When Mother Couldn't Feed It A month-old polar bear cub is being raised by humans at a Danish zoo after his mother failed to produce enough milk to feed him, the Associated Press reported. The cub, Siku, is doing "really fine," Scandinavian Wildlife Park manager Frank Vigh-Larsen said. The cub was 3 pounds at birth, and now weighs 7 pounds. Siku was taken from his mother when he was two days old, because he was "moaning and being unruly all the time." Siku is being touted as the new Knut, a polar bear who was born in the Berlin Zoological Garden and rejected by his mother. To see more baby animals, click here. The Associated Press contributed to this report.