How does a female walrus raise her baby?

Adult Male Walruses reach sexual maturity as early as 7 years but typically dont get to mate until they are around 15 years old. Females on the other hand reach maturity between 4 to 6 years. Breeding occurs between January to March. Males compete for mating rights and the stronger and bigger males win over the smaller and younger ones. Calves are born during Spring between April to June.