Which of the following is a behavioral sign of developmental delay?

Avoiding eye contact is a behavioral sign of developmental delay because it can indicate challenges in social communication and interaction, which are critical components of a child's developmental milestones. Children who exhibit this behavior may struggle with understanding social cues, forming connections with peers, or engaging effectively with adults. In early childhood education, eye contact is often associated with engagement and responsiveness, so a lack of it can raise concerns about a child's developmental progress.

In contrast, excessive talking can be a sign of advanced verbal skills rather than a delay. Healthy social interactions demonstrate appropriate developmental progress, while a short attention span can be typical in certain developmental stages but does not directly signify a delay. Each of these other behaviors reflects normal variations in development rather than an outright indicator of delay, making avoiding eye contact the most relevant sign in this context.