In this sentence, "one" is a pronoun. It refers to the thing the child wants.
Other examples of "one" used as a pronoun:
One of us will go to the store.
I ate one of the last cookies.
Examples of "one" used as an adjective:
She ate only one cookie.
Write a one-page essay.
Each child will want one of those.
is one a pronoun or adj?
I think it is a adjective
2 answers
No, it's a pronoun.