A man has been charged with allegedly causing grievous bodily harm to a baby who was admitted to the Royal Hobart Hospital with severe head injuries.
Hospital staff alerted police on Thursday after the infant was brought in for treatment the night before.
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The baby remains in hospital in a serious condition.
Glenorchy Criminal Investigation Branch (CIB) detectives have launched an investigation into the incident.
A property in Claremont has been cordoned off and declared a crime scene.
Police have confirmed the 24-year-old Claremont man accused is known to the infant.
He was taken into custody and will appear before the Hobart Magistrates Court this morning.