Step 1: The key word is repetitive abuse spread over weeks to months by a caregiver, so injuries accumulate at different times.
Step 2: Bruises change color predictably as they heal, so bruises showing several different colors at once prove they were inflicted on separate occasions - the signature of ongoing battering.
Step 3: Add a discrepant or evasive history, injuries away from the usual accidental sites, and healing fractures of varying age, and the picture is non-accidental injury.
Step 4: Single sharp or firearm wounds do not fit a pattern of chronic abuse, so the answer is multiple bruises of varying ages.
\[\boxed{\text{Bruise of different ages}}\]