A joey is a young kangaroo, so there is no stage between a joey and a full-grown kangaroo. The joey grows inside its mother's pouch until it is old enough to emerge and become a kangaroo.
A kangaroo joey weighs about 0.5 grams at birth.
No a joey is a baby kangaroo
When first born, a Red kangaroo's joey is barely 2cm long.
A joey
joey
Yes. The young of all kangaroos (and indeed, all marsupials) are called joeys.
No, the word "joey" is not capitalized when referring to a baby kangaroo. It is treated like a common noun.
a juvenile kangaroo
A kangaroo's offspring.
Joey
joey