Normal bruising or bleeding due to accidental injury is commonly seen around the age of 1 when most children become mobile or 'cruising' (1)
In non mobile infants usually before the age of 9 months, occurrence of significant bruising is abnormal and is beyond the spectrum of 'normal' bruising (2)
A child with bruises in the typical distribution but seems to be "over bruised" may have a mild coagulation defect (4).
Abnormal bruising
Patients who present with an "abnormal" pattern of bruising may have a haemostatic disorder or may have been subjected to non-accidental injury (NAI).
Reference:
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