childish

Don't be such a baby. 
Grow up, will you??? 
What's the matter, 
not tough enough?
That's SO juvenile!
You're such a child!
When I became a man,
I put away childish things.

Let the children come to me,
God's kingdom belongs to
such as them. Don't we
need to be childish
to understand, to see
with perfect clarity?
Childhood is the kingdom
where nobody dies.
Recovery? Child's play.

But to carry on into middle life or even into early manhood this concern about being adult is a mark of really arrested development. When I was ten, I read fairy tales in secret and would have been ashamed if I had been found doing so. Now that I am fifty I read them openly. When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.

C.S. Lewis