* Blue whale: Calves are born weighing around 2,500 to 3,000 kilograms (5,500 to 6,600 pounds).
* Fin whale: Calves are born weighing around 2,000 to 2,500 kilograms (4,400 to 5,500 pounds).
* Humpback whale: Calves are born weighing around 1,500 to 2,000 kilograms (3,300 to 4,400 pounds).
* Right whale: Calves are born weighing around 1,500 to 2,000 kilograms (3,300 to 4,400 pounds).
* Sei whale: Calves are born weighing around 1,000 to 1,500 kilograms (2,200 to 3,300 pounds).
* Minke whale: Calves are born weighing around 500 to 1,000 kilograms (1,100 to 2,200 pounds).
* Sperm whale: Calves are born weighing around 1,500 to 2,000 kilograms (3,300 to 4,400 pounds).
It's important to note that these are approximate weights and there can be variation within each species.