It depends on the type of whale. Blue whale babies, for instance, grow at a phenomenal rate – almost 200 pounds a day for their first year, and on a diet of only milk. But then they weigh three tons and are 25 feet long at birth, so theirs might be an anomalous case.
A blue whale baby (for more images and a video of a blue whale baby, see second link below):
Gray whales, on the other hand, are born smaller and grow at a slower rate than the blue whales mentioned above. At birth, they usually weigh 1500 pounds (less than one ton), and are only 15 feet long. After this, they can gain weight at a rate of 70 pounds per day.
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