Police are investigating how a four-month-old baby came to be seriously injured in Hamilton last month.
The baby boy was taken by ambulance to Waikato Hospital on 19 June in a critical condition, police said.
"He suffered a significant head injury which is being treated as unexplained while police work to establish the cause."
He is now in a stable condition.
Anyone with information is encouraged to contact police on 105 and quote file number 210619/5816.
Information can also be provided anonymously via Crimestoppers on 0800 555 111.
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