Police have arrested a person of interest and say they are not looking for anybody else. This person was not hospitalised, a spokeswoman said.
The incident happened at a property on Anthony Cr, Bader in Hamilton. Photo / GoogleOfficers were due to remain at the property overnight and a scene examination continues.
Police declined to provide any further details, including whether the detained person faces any charges or if they will appear in court.
The Herald understands there is a major police investigation underway at the Anthony Cr property while the child fights for their life.
A police spokeswoman said they would provide an update tomorrow.