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How long are seals pregnant?

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A crabeater seal (Lobodon carcinophagus) lies on snow-covered ice with its mouth open, surrounded by broken sea ice in East Antarctica. — seal Crabeater seal (*Lobodon carcinophagus*).

The length of gestation in seals varies by species, but it is commonly around 11 to 11.5 months due to a biological process known as delayed implantation.

During this process, the fertilized egg develops into a blastocyst but remains dormant in the uterus for several months before implanting in the uterine lining for active development. This adaptation allows the seals to time the birth of their young to coincide with periods when environmental conditions, such as the availability of pack ice, are most favorable.123

Specific examples include:
* Harp seals: Have a total gestation period of approximately 11.5 months, with the blastocyst floating freely for four months before implantation.2
* Bearded seals: Have a gestation period of about 11 months.4
* Elephant seals: Have a total pregnancy lasting about 11 months, which includes a three-month dormancy period before the fertilized ovum implants.3