Little is an adjective which doesnt really apply to a whale calf. At birth it can already weigh several tons. For instance, between six and eight tons for the blue whale, up to a ton for the sperm whale. The mother whale feeds her calf on milk and the young whale grows at a hundred kilos a day, four and a half kilos every hour. Whale milk has a very high fat content and actually contains thirtyfive percent fat. This is equal to ten times the amount of fat contained in the cows milk we drink