What is a key indicator of developmental delay in a child?

The inability to walk by the age of 15 months is a significant indicator of developmental delay in a child. Walking is a major milestone in physical development, and most children achieve this skill by the time they are about 12 months old, with a range extending to 15 months. If a child has not begun to walk by this age, it may suggest a delay in gross motor development. This inability can signal potential underlying issues and may warrant further evaluation to determine the cause and provide appropriate support or intervention.

The other choices do not reflect developmental delays. For instance, the ability to talk at an early age is generally considered a positive indicator of language development, while excessive engagement with peers shows social developmental progress. Likewise, early development of fine motor skills is viewed as an advantageous sign of a child's growing coordination and dexterity. Thus, the inability to walk by 15 months stands out as a critical marker for potential developmental concerns.