LONDON — When the polar bear was born just before Christmas in Scotland — the first in Britain in 25 years — zoologists could confirm the occasion only because of the high-pitched sounds coming from the mother’s den.

The cub did not emerge for weeks, but now the tiny polar bear is moving around “confidently,” the zoo says, and will get the star treatment in a documentary set to air Sunday on Channel 4.

The mother, Victoria, is one of three adult polar bears at the Royal Zoological Society of Scotland’s Highland Wildlife Park at Kincraig, near Aviemore. She mated with Arktos, one of two males at the park, and gave birth to the cub.

Una Richardson, the park’s head keeper responsible for carnivores, said in a statement: “We couldn’t be happier.”