Final answer:
Social comparison is the term used to describe a child's tendency to scrutinize themselves in relation to other children their age. It is a factor in the development of self-concept.
Step-by-step explanation:
A child's tendency to scrutinize themselves in relation to other children their age is referred to as social comparison. Social comparison is a factor in the development of self-concept, which is a person's perception of themselves. Children compare themselves to others to assess their own abilities, strengths, and weaknesses, and this comparison affects their self-esteem and confidence.