As far as i know mammals can only be born live. So, No.
Echidnas are hatched. They are monotremes, or egg-laying mammals.
not mammals
No, whales are mammals.
Nutrias are mammals.
Both are hatched from eggs. Neither are mammals
Platypuses a not born: they are hatched from eggs. Although mammals, they are egg-laying mammals, or monotremes. A newly hatched platypus is about the size and weight of a bean. It is blind, hairless and completely helpless.
Dolphins are mammals and therefore do not lay eggs
Platypuses are hatched from eggs. They are one of just two species of egg-laying mammals.
Platypuses are not born. They are hatched. Platypuses are monotremes, or egg-laying mammals. And yes, when first hatched, they are completely furless.
Raccoons are mammals so they are born alive
They are mammals. Their young are born live from the womb, not hatched from eggs.
Gorillas are mammals - they give birth to live babies.