So far 13 people have caught the illness through a group visiting Australia.
A baby is the latest casualty of a highly infectious measles outbreak, as health workers treat fresh cases in the Taupo region.
Bay of Plenty Medical Officer of Health Dr Phil Shoemack confirmed doctors treated two new cases this week.
A 15-month-old unvaccinated baby was admitted to Rotorua Hospital after the sick tot was assessed by a local doctor.
Another child from the same extended family also fell ill with the disease.