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Difficulty: HardNormal Growth and Development

An 18-month-old girl is brought to the clinic for a routine well-child evaluation. Her mother expresses anxiety because the child seems "behind" her older cousin. The mother reports that the girl plays alongside her cousin but rarely interacts directly or shares toys with him. She communicates using approximately 15 single words and points to desired objects. She can walk independently but creeps up the stairs on her hands and knees. During the examination, the child is observed sitting on the floor. She builds a tower of three cubes using exclusively her right hand; her left hand remains predominantly fisted and rests at her side. When offered a spoon, she attempts to mimic feeding herself but frequently drops it. Which of the following findings in this patient is most concerning and requires further medical evaluation?

  1. Exclusive use of the right hand during playAnswer
  2. B
    Vocabulary limited to single words without phrases
  3. C
    Engagement in parallel play rather than cooperative play
  4. D
    Creeping up the stairs on hands and knees
  5. E
    Inability to proficiently use a spoon without dropping it

Answer

Exclusive use of the right hand during play
The development of clear hand preference before the age of 2 to 3 years is considered a significant developmental red flag. In a typically developing child, handedness is not firmly established until preschool age. When an infant or early toddler (like this 18-month-old) demonstrates exclusive use of one hand, especially when the contralateral hand remains fisted or inactive, it is highly indicative of a focal upper motor neuron lesion, such as spastic hemiplegia (a subtype of cerebral palsy). This finding warrants prompt referral for a comprehensive neurologic evaluation and potential neuroimaging.

Step-by-Step Solution

1
Evaluate the patient's language and social milestones for her age (18 months).
Vocabulary of 15 words and parallel play are age-appropriate. Two-word phrases and cooperative play are not expected until 24 months and 4 years, respectively.
To rule out isolated or global developmental delay.
2
Evaluate the patient's gross and fine motor milestones.
Walking independently, creeping up stairs, building a tower of 3 cubes, and attempting to use a spoon are all appropriate for an 18-month-old.
To identify any lag in motor skill acquisition.
3
Identify any focal neurologic signs or red flags in the physical presentation.
The patient uses her right hand exclusively while keeping her left hand fisted.
Early handedness before age 2-3 years suggests a contralateral motor deficit.

Key Concept

Developmental red flags and normal milestone timelines
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Topics

Normal Growth and Development

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