During a pediatric clerkship, a medical student is evaluating several children in the outpatient clinic. Match each set of observed developmental milestones to the most appropriate expected chronological age.
- Sits completely unpropped, transfers objects from one hand to the other, babbles using consonants, and exhibits stranger anxiety.6 months
- Stands independently, uses a mature two-finger pincer grasp, points to request toys, and says 'mama' and 'dada' specifically.12 months
- Jumps with both feet, builds a tower of six blocks, uses two-word phrases, and engages in parallel play with peers.24 months
- Rides a tricycle, copies a circle with a crayon, speaks in three-word sentences, and knows their own age and gender.3 years
Answer
The correct matches align the milestones with their respective ages: sitting unpropped matches 6 months; standing independently matches 12 months; jumping and two-word phrases match 24 months; and riding a tricycle matches 3 years.
Developmental milestones are systematically assessed across gross motor, fine motor, language, and social domains. At 6 months, an infant achieves truncal stability to sit unassisted. At 12 months, upright locomotion begins with standing or walking, alongside fine motor maturation (mature pincer grasp). By 24 months, gross motor coordination improves (jumping) and vocabulary expands to two-word phrases. By 3 years, complex bilateral coordination (pedaling a tricycle) and expressive language (three-word sentences) are firmly established.
Step-by-Step Solution
Key Concept
Normal Pediatric Growth and Developmental Milestones
Estimated Time:1m 30s