It is incorrect to say that a kitten is a baby of a squirrel species, as kittens are the offspring of cats. Squirrels give birth to their own young, which are called kits or pups. Each species of squirrel has a different name for their babies, such as a baby red squirrel being called a kitten.
Their ears are small and round and their tail is short, stubby, and black or brown in color. Despite their diminutive size, baby squirrels grow quickly in the first two weeks, but most don't open their eyes until 4 weeks of age.