During a series of routine developmental surveillance visits, a clinical team documents the maturation of a healthy infant's fine motor skills. The evolution of object prehension follows a predictable neurodevelopmental sequence, characterized by a proximal-to-distal progression of control. Arrange the following fine motor achievements in the correct chronological order of their typical acquisition, starting with the earliest milestone and ending with the latest.
- 1Secures an object using the ulnar aspect of the palm without thumb involvement
- 2Successfully transfers a single object from one hand to the other
- 3Uses a raking motion with multiple fingers to sweep a small object toward the palm
- 4Picks up a small pellet using a precise, tip-to-tip pincer grasp
- 5Builds a vertical tower consisting of two distinct blocks
Answer
The correct sequence is: securing an object without thumb involvement (ulnar-palmar grasp), transferring an object between hands, using a raking motion, picking up a pellet with a precise pincer grasp, and finally building a tower of two blocks.
Fine motor development in infants proceeds in a predictable proximal-to-distal direction. Around 4 to 5 months, infants begin purposeful reaching but can only secure objects using a crude ulnar-palmar grasp without thumb opposition. By 6 months, their coordination improves, allowing them to transfer objects across the midline from one hand to the other. At 7 to 8 months, infants begin using a raking motion to sweep small objects toward the palm. By 10 to 12 months, advanced digit isolation enables a mature, tip-to-tip pincer grasp for picking up small items. Finally, at 15 months, the infant develops the spatial awareness and voluntary, controlled release necessary to stack two blocks.
Step-by-Step Solution
Key Concept
Normal sequence of fine motor and prehension development in the first 15 months of life
Estimated Time:1m 0s