Juvenile Sei Whales Grow Rapidly During Their First Year of Life

A newborn sei whale can double in size within months of birth.

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Sei whale milk can contain over 30 percent fat, supporting rapid calf growth.

Sei whale calves are born at lengths of about 4 to 5 meters and grow quickly while nursing on high-fat milk from their mothers during the first 6 to 9 months.

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Rapid early growth helps calves build the blubber reserves necessary for thermoregulation and long-distance migration alongside their mothers.

This accelerated development reflects the high-energy investment required from females, who often fast or reduce feeding during nursing periods.

Source

NOAA Fisheries

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