Match each pediatric patient's clinical presentation with the most accurate developmental assessment or underlying etiology.
- An 18-month-old with a vocabulary of 3 words, who points to desired objects, follows one-step verbal commands, and has normal hearing testing.Isolated expressive language delay
- A 14-month-old who crawls efficiently and cruises along furniture but has not yet taken independent steps; neurologic examination is normal.Normal variation in gross motor development
- A 9-month-old who sits only when propped, demonstrates a persistent Moro reflex, and exhibits increased muscle tone in the lower extremities.Upper motor neuron pathology
- A 24-month-old whose weight has dropped from the 50th to the 5th percentile over 6 months, while length and head circumference remain at the 50th percentile.Inadequate caloric intake
Answer
The presentations map directly to their specific assessments: the 18-month-old has an isolated expressive language delay; the 14-month-old shows a normal gross motor variation; the 9-month-old exhibits signs of upper motor neuron pathology; and the 24-month-old displays growth chart patterns characteristic of inadequate caloric intake.
Each patient presentation contains specific clues differentiating normal variations from pathology. The 18-month-old has a specific expressive language delay but normal receptive and social skills. The 14-month-old is within the normal 12-18 month window for achieving independent walking. The 9-month-old has pathologic retention of the Moro reflex, which should resolve by 4-6 months, pointing to an upper motor neuron lesion. The 24-month-old's asymmetric growth restriction (weight drops before height/head circumference) is the classic pattern for nutritional failure to thrive.
Step-by-Step Solution
Key Concept
Accurate assessment of normal variations, specific milestone delays, and distinct red flags in pediatric growth and development is essential for timely intervention and avoiding unnecessary testing.