Nils's Lullabye
An infant boy is left all alone. It's up to Nils and Carrot to keep him safe from roaring rapids, snakes, and Rex the fox! Source: crunchyroll
Aired 13/01/1981EP 43 - Nils's Lullabye

The Wonderful Adventures of Nils Holgersson
Nils is a lazy and greedy boy whose mischief makes everyone miserable, whether it's his parents, the animals on his farm, or the fairy-like tomte he captures one day. But he gets his comeuppance when the pint-sized tomte casts a spell to make Nils just as tiny as him! The only way to break the spell is to go on a journey to distant Lapland with Morten the farm goose, Carrot the hamster, and a flock of wild geese.
Along the way, he contends with cruel witches, talking statues, wise ravens, and one very persistent fox. Under the guidance of the stern but caring Captain Akka, leader of the flock, Nils discovers his kind heart and his love for nature. But when the time comes, will he be able to choose between his human family and his feathered friends?
(Source: Discotek Media)