Blue whales are pregnant for 10-12 months. The newborn calf is about 7.5 m long and weighs about 5.5 – 7.3 tonnes. A baby blue whale drinks about 225 litres (about enough to fill a bath) of its mother’s fat-laden milk (it is 40-50% fat) a day, gaining 3.7 kilograms an hour, until at age 8 months then they are 15 m long and 22.5 tonnes making them the biggest babies in the world, right after you.
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3.7 kg per hour? Wth....
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Yeah, I got this from reddit, it's not to be trusted lmao. [spoiler]( ͡° ͜ʖ ͡°)[/spoiler]