<P> Females typically give birth once every two to three years at the start of the winter after a gestation period of 10 to 12 months . The calf weighs about 2.5 tonnes ( 2.8 short tons ) and is around 7 metres ( 23 ft ) in length . Blue whale calves drink 380 -- 570 litres ( 100 -- 150 U.S. gallons ) of milk a day . Blue whale milk has an energy content of about 18,300 kJ / kg ( 4,370 kcal / kg ) . The calf is weaned after six months , by which time it has doubled in length . The first video of a calf thought to be nursing was made 5 February 2016 . </P>
<P> Females typically give birth once every two to three years at the start of the winter after a gestation period of 10 to 12 months . The calf weighs about 2.5 tonnes ( 2.8 short tons ) and is around 7 metres ( 23 ft ) in length . Blue whale calves drink 380 -- 570 litres ( 100 -- 150 U.S. gallons ) of milk a day . Blue whale milk has an energy content of about 18,300 kJ / kg ( 4,370 kcal / kg ) . The calf is weaned after six months , by which time it has doubled in length . The first video of a calf thought to be nursing was made 5 February 2016 . </P>
how long does it take for a blue whale to give birth
how long does it take for a blue whale to give birth
10 to 12 months
10 to 12 months