Te Whatu Ora is asking the High Court to take guardianship of the four-month-old to allow him to have an operation he needs for his serious heart condition.
The baby's parents won't consent to the surgery unless blood from unvaccinated donors is used.
Haematologist and transfusion medicine specialist Dr Jim Faed says direct donation of blood from people who aren't vaccinated could be difficult.
He spoke to Corin Dann.
