You are assessing a 7-month-old infant. Which of the following findings would be considered the most significant red flag for neurological dysfunction?

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

Primitive reflexes are involuntary motor patterns that are inhibited as the central nervous system matures.
The palmar grasp reflex normally disappears by 3 to 4 months of age to allow for the development of voluntary grasping.
Persistence of the palmar grasp reflex at 7 months indicates a delay in neurological maturation and is a significant red flag for disorders such as cerebral palsy.

Option A: The gag reflex is a normal, protective reflex that persists throughout life. Its presence is an expected and healthy finding, not a red flag.
Option B: The Moro reflex typically disappears by 3 to 6 months. Therefore, its absence in a 7-month-old infant is a normal and expected sign of neurological development.
Option D: A positive Babinski sign is a normal finding in infants up to 12 to 24 months of age due to the incomplete myelination of the corticospinal tracts. It is not a sign of dysfunction at this age.

Visual 1: Table - Timeline of Primitive Reflexes. A chart showing the typical age of appearance and disappearance for key infant reflexes (e.g., Moro, grasp, rooting, Babinski, tonic neck). This helps visualize why persistence of the palmar grasp at 7 months is abnormal.
Visual 2: Demonstration - Palmar Grasp Reflex. An image or short video showing how to elicit the palmar grasp reflex by placing a finger in the infant's palm, and the resulting involuntary flexion of the fingers.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of primitive reflexes and neurological development in infants as background academic context rather than a clinical decision trigger.
The routine assessment of primitive reflexes is a fundamental nursing responsibility during well-child visits. It allows for the early detection of potential developmental delays or neurological disorders.
Any abnormal findings, such as the persistence of a reflex, must be carefully documented and reported to the healthcare provider for further investigation, which may include a referral to a pediatric neurologist.
What if? If the infant was born prematurely at 28 weeks, their corrected age would be approximately 4 months (7 months actual age minus 3 months premature). In a 4-month-old (corrected age), the palmar grasp reflex might still be present and would be considered less of a red flag, though it should be fading.

How to Approach the Question

First, identify the key information in the question stem: the patient is a 7-month-old infant, and you are looking for the 'most significant red flag' for neurological dysfunction.
Next, systematically evaluate each option based on your knowledge of normal infant developmental milestones and primitive reflexes.
For each reflex, ask yourself: 'Is this finding normal or abnormal for a 7-month-old?'
Option A (Gag reflex): This is a lifelong reflex. Its presence is normal.
Option B (Absence of Moro): This reflex disappears by 6 months. Its absence at 7 months is normal.
Option D (Positive Babinski): This reflex is normal until 1-2 years. Its presence at 7 months is normal.

Concept Tested & Keywords

Concept Tested: Assessment of primitive reflexes and neurological development in infants.
Stem keywords: 7-month-old infant, neurological dysfunction, red flag
Lead-in keywords: most significant
Clinical cues: The infant's age of 7 months is the critical data point for evaluating the normalcy of primitive reflexes.

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Practise the full RRB Nsg. Superintendent-2026 (Shift -1st)

Attempt every question from this paper in a timed mock, then review the full solution for each one.