Nothing is known about the mating systems of M. bidens.
Little in known about general reproductive behavior of M. bidens. Mating is thought to occur in late winter, with births late in spring and gestation lasting about 12 months. Young are about 2.4 to 2.7 meters in length and weigh about 185 kg.
Breeding interval: Breeding interval is not known for Sowerby's beaked whales.
Breeding season: Mating is thought to occur in late winter.
Average number of offspring: 1.
Average gestation period: 12 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); viviparous
Sowerby's beaked whale females provide milk for their young and protect them. There is no other available information on parental investment.
Parental Investment: precocial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female)