What is the appropriate evaluation and management for a 2‑month‑old infant with a head injury?

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Last updated: September 14, 2026 • View editorial policy

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Head Injury in a 2-Month-Old Infant

Use the PECARN clinical decision rule to stratify risk and determine whether head CT is needed—infants <3 months with head trauma meeting very low-risk criteria can safely forgo CT imaging, but this age group requires heightened vigilance as they have significantly higher rates of traumatic brain injury and mortality compared to older children. 1

Risk Stratification Using PECARN Criteria for Infants <2 Years

For a 2-month-old infant, apply the age-specific PECARN criteria to categorize risk:

Very Low Risk (CT NOT indicated)

The infant meets ALL of the following:

  • Glasgow Coma Scale (GCS) = 15
  • Normal mental status
  • NO palpable skull fracture
  • NO nonfrontal scalp hematoma
  • NO loss of consciousness >5 seconds
  • NO severe mechanism of injury
  • Acting normally per parents

If all criteria met: Risk of clinically important traumatic brain injury is <0.02%. These infants can safely forgo CT imaging. 1

Intermediate Risk (CT may be considered vs. observation)

GCS = 15, normal mental status, no palpable skull fracture, BUT one or more of:

  • Loss of consciousness >5 seconds
  • Severe mechanism of injury
  • Not acting normally per parent

Risk of clinically important TBI: ~0.9%. CT may be considered based on parental preference, multiple risk factors, worsening symptoms during observation, or difficulty assessing the infant clinically. 1

High Risk (CT strongly recommended)

Any of the following:

  • GCS = 14
  • Other signs of altered mental status
  • Palpable skull fracture

Risk of clinically important TBI: ~4.4%. Imaging is strongly recommended due to substantial risk of intervene-able injury. 1

Critical Considerations for Infants <3 Months

This age group is uniquely vulnerable and requires special attention:

  • Higher injury rates: Infants <3 months are significantly more likely to undergo cranial imaging (50.3% vs 18.3% for older children), be diagnosed with TBI (17.5% vs 2.7%), have clinically important TBI (4.6% vs 0.5%), and die (0.3% vs 0.1%). 2

  • Subtle presentations: Even infants meeting PECARN low-risk criteria remain at risk for TBI on CT (5.1%) and skull fractures (4.6%), though clinically important TBI risk remains very low (0.2%). 3

  • Common findings: When skull fractures occur, 55% have associated intracranial hemorrhage (most commonly subdural), and 61% require critical care admission. 4

Imaging Recommendations

When CT is indicated:

  • Use pediatric-specific protocols with dose reduction techniques
  • Multiplanar and 3D reconstructions increase sensitivity for fractures and small hemorrhages 1
  • Discuss radiation risks with family in context of injury risk factors 5

Skull radiographs: Not sufficient—up to 50% of intracranial injuries occur without fracture, and radiographs miss many fractures. 1

MRI: Not practical in acute setting due to length of examination, need for sedation in infants, and delayed results. 1

Essential Clinical Pitfalls

  1. Do not rely on "normal behavior" alone: Provider-documented normal behavior and parent-reported normal behavior showed relative risks of 1.32 and 1.21 for intracranial hemorrhage, respectively—meaning "normal" behavior does NOT exclude significant injury. 4

  2. Consider non-accidental trauma: In infants <3 months with skull fractures, child welfare assessments are frequently needed (64% of cases), particularly when intracranial hemorrhage is present. Bilateral fractures, bridging vein rupture, or injury inconsistent with mechanism should raise concern. 4, 6, 7

  3. Minor mechanisms can cause significant injury: Falls from low heights and minor impacts can result in skull fractures and intracranial hemorrhage in this age group. 4, 6

  4. Observation challenges: Clinical observation is more difficult in young infants, which may lower the threshold for imaging in intermediate-risk cases. 1

Management Algorithm

  1. Assess GCS and perform focused neurological examination
  2. Examine for palpable skull fracture, scalp hematomas (especially nonfrontal), altered mental status
  3. Obtain detailed history: mechanism, loss of consciousness duration, vomiting, parental assessment of behavior
  4. Apply PECARN criteria to stratify risk
  5. Very low risk: Observation without CT (discuss warning signs with family)
  6. Intermediate risk: Consider CT vs. observation based on clinical factors and ability to monitor
  7. High risk: Obtain head CT without contrast
  8. If any concern for non-accidental trauma: Consult child protection team and consider skeletal survey

References

1
Guideline

acr appropriateness criteria® head trauma-child.

Journal of the American College of Radiology, 2020

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.