Lanugo.
This fine hair is called "lanugo."
soft fine hair that covers an infant is called downy hair
It is called nymph
The name for a newborn star is called a gosling. This name is given until the grow big enough to be an adult.
We call baby seals pups.
Newborn mice are called pups. They may also be called "pinkies" because their skin is a reddish pink color when they are first born.
A newborn elephant is called a calf.
A newborn sheep is called a 'lamb'.
Yes. The color of a newborn's hair can be different (almost always lighter) than the eventual adult hair color.
Either a pup, kit, or cub. There is no specific name. It varies.
Newborn and young Thylacines were called joeys. This is the name given to the young of all marsupials. Although the Thylacine was also commonly called either a Tasmanian tiger or a Tasmanian wolf, its young were not called cubs.
No other name is used besides kitten. So kittens are what they are called.