Which of the following is a sign of developmental delay in children?

Late walking is indeed a sign of developmental delay in children because walking is a significant milestone in physical development, typically achieved between 9 to 15 months of age. If a child is significantly delayed in walking, it could indicate issues with motor skills development or other underlying health concerns that might require further assessment.

In contrast, advanced verbal skills, early social interaction, and regularly meeting milestones are indicators of healthy development. Advanced verbal skills suggest that a child is developing language abilities more quickly than expected, while early social interaction indicates positive social and emotional development. Regularly meeting milestones reflects that a child is developing as expected according to age-related benchmarks. These aspects are key indicators of healthy growth and development, not signs of delay.