The parent of a 4 year old expresses concern because her hospitalized child has started sucking his thumb. The mother states that this behavior began 2 days after hospital admission. Which of the following is the appropriate nursing response?
A. "It is best to ignore the behavior."
B. "Your child is acting like a baby."
C. "The doctor will need to be notified."
D. "A 4 year old is too old for this type of behavior."