For most mammals its "litter."
The mother dog gave birth to a litter of puppies.
litter
I'd call that a brood. I guess the word siblings would work also.
Mammals give birth to live young instead of in an egg
A group of kittens is called a kindle or litter (group of young cats born to one female).
A panda is a marsupial which means the young develop in a pouch. They are known as pouch animals because the adult female have a pouch on the outside of the body where the young grow up and keeps the baby warm and safe.
A group of cygnets is called a brood or a clutch. This term refers to a group of young swans that are typically born in the same hatch.
In many movies, such as "Bambi", the mother animals teach their young how to survive but in reality, the animals are born with a natural instinct to protect themselves.
Animals that are mammals nourish their developing young inside the mothers body and then provide milk for them after they are born. Some animals that are mammals are elephants, cows, dogs, and humans.
most of the time, baby animals are born in the spring. Their parents need to have their young when there is lots of food available and the longer days mean that they have longer time to find food for their young. See the related link below.
Rabbits and foxes are animals whose young are commonly referred to as kits. Kits are typically born in litters and are cared for by their mothers until they are old enough to fend for themselves.
Jellyfish young are born in protective jelly which floats. The jelly-like substance is called a planula and serves to protect the developing young until they are ready to swim on their own.
Mammals are warm-blooded animals that give birth to live young. This includes animals such as dogs, cats, elephants, and humans.