Which developmental milestone would the nurse expect an 11-month-old infant to have achieved?

Choice A reason: Building a tower of four cubes is typically achieved around 18 months of age. At 11 months, fine motor skills are still developing, and stacking multiple cubes is beyond the expected milestone. Choice B reason: Sitting independently is a milestone usually achieved between 6 and 9 months. By 11 months, most infants can sit without support and maintain balance while playing. This is a foundational gross motor skill and expected at this age. Choice C reason: Walking independently usually occurs between 12 and 15 months. Some infants may begin cruising or taking steps with support at 11 months, but full independent walking is not expected yet. Choice D reason: Turning a doorknob requires refined fine motor coordination and strength, typically seen in toddlers closer to 2 years old. It is not an expected milestone for an 11-month-old.