Walruses are highly sociable animals and are gentle creatures unless attacked. The females give birth from April into June as they migrate north. Younger females may bear one calf two years apart while older females give birth less often. Calves are born on ice and twin births are rare. 
Source:
http://animals.nationalgeographic.com/animals/photos/walruses/walrus-pup-nuzzling-mother.html
Walruses are large marine mammals and are related to seals. They are notable for a pair of long ivory tusks formed by the canine teeth in the upper jaws and has the scientific name of Odobenus rosmarus, from the Latin for "tooth walking sea-horse". Walruses do not actually use their tusks for walking, but they do help the hulking animals haul themselves out of water.
“Mothers are extremely protective and the young may ride on their backs.” We shall see how…To view the clearer full-length video, please refer to:
http://video.nationalgeographic.com/video/player/specials/editors-picks-specials/animal-moms/walrus_cuddle.html
It is interesting to know that walrus holds her like a human would and they share similar attributes with human in
caring for their young ones. Hugging and having constant physical contact to establish a close bond between mother and child.
Source:
http://www.birthmuse.org/
Such are undeniable maternal instincts by nature.
The love of a female walrus for its calf can be proven from
seen from this article: He’s a Baby, He’s Big and Getting Bigger, and the City Aquarium Is So Proud
Sources:
"He’s a Baby, He’s Big and Getting Bigger, and the City
Aquarium Is So Proud" by Andy Newman. The New York
Times, September 28, 2007.
"Odobenus rosmarus" from National Geographic
"Walrus" MSN Encarta Microsoft® Encarta® Online Encyclopedia 2007
"Walrus" from Wikipedia