Sally takes her 20-month-old son to the park. after playing for five minutes he runs back to mom, touches her, and then runs off again. the son's behavior would be called:

Contact-maintaining.

Explanation:

Contact-maintaining is the term used to describe the situation where a child shows resistance to leaving his or her mother (or a responsible adult) and when he or she needs to go out looking for a way to maintain physical contact with the mother. An example of this can be seen in the question above, where Sally's son, whenever he walks away from her, comes back to where his mother is, touches her and walks away again.

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