For most mammals its "litter."
The mother dog gave birth to a litter of puppies.
litter
I'm fairly certain that a group of newly hatched/born animals, of any kind, is called a brood.
Frogs
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.
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.
Animals mate so that their young are born when there will be food. This is also based on how long the mothers need to carry the young in the womb. Deer mate in the fall because the fawns best chance of survival is to be born in the spring when there is grass to eat.
Sickle cell is an inherited blood disorder. It is a illness that you are born with.