You are correct!
From our dictionary:
pu•er•ile
(pyOO'ur-il, -u-rīl", pyoor'il, -īl),
—adj.
1. of or pertaining to a child or to childhood.
2. childishly foolish; immature or trivial: a puerile piece of writing.
(pyOO'ur-il, -u-rīl", pyoor'il, -īl),
—adj.
1. of or pertaining to a child or to childhood.
2. childishly foolish; immature or trivial: a puerile piece of writing.
