Precocious, unless you are referring to a medical condition causing premature aging.
spawn Prolific
The plants in my garden grow quickly in the warm sunlight.
U can't the baby has to grow up itself.
superior government
quickly
Antelopes, being preyed upon by several carnivore species, have to grow up quickly.
I can give you several sentences.When you grow up, you'll understand why I had to punish you."Oh, grow up!" she said angrily, "You're so childish!"Baby animals grow up quickly.
up state
You either grow up rather quickly or die.
grow up
to age
Both armies quickly set up camp.adverb is quickly