Question

select the derivative of child that is an adjective that means “somewhat like a child.”
suggestion
ill
childish
helpful
treatment
helpless
forgetful
illness
suggestible
childhood
treatable
forgetfulness

Explanation:

The word "childish" is an adjective derived from "child" and means somewhat like a child, often with a negative connotation of immaturity. Other words either are not derived from "child" or do not have the meaning of being somewhat like a child.

Answer:

childish