The mom, lying on a patch of land in the tide pool, gave birth to her pup in drizzling rain.
As soon as the pup is born and the mother pulls it toward her, she grooms the pup to keep it buoyant, warm and get its blood flowing.
According to the aquarium, otters can give birth on land or in water.
Related: 'The squee heard 'round the world': Wild sea otter gives birth at California aquarium
Although the video is graphic, it shows a rare wild otter birth, which was special for visitors and staff at the aquarium.
"Our sea otter researchers have been watching wild otters for years and have never seen a birth close-up like it," the aquarium said.
The Los Angeles Times reported that the otter pup and its mother swam out to sea Monday, but the pair later returned to the pool.
The aquarium said they will soon leave as the mother looks for kelp and other food to eat.
The wild sea otter mom and pup that captured our hearts this weekend will likely move soon from our Great Tide Pool to the kelp forest out in the bay so mom can forage for a much-needed meal! Mother otters certainly have their paws full nursing and grooming a newborn pup, as you can see in this clip. By the time a pup is two months old, it’ll have shed most of its fluffy pup coat and be doing lots of exploring and even a bit of diving. Soon it will be playing its role as a keystone species, keeping kelp-grazing sea urchins in check!Posted by Monterey Bay Aquarium on Monday, March 7, 2016
This isn't the first time a wild otter gave birth at the Monterey Bay Aquarium. Another otter pup was born in December.