Efforts are being made to ensure children get vaccinated on time.
Counties Manakau Health is running a pilot which offers incentives like petrol vouchers and nappies to parents who bring their children in.
Child Poverty Action Group spokesperson and director of the Immunisation Advisory Centre at the University of Auckland Nikki Turner says it's very important work.
"We've got maybe 30 or 40 percent of our children getting their vaccines on time. Anything that is going to help parents manage to get their kids in on time is worth doing."
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Dr Turner says children are at risk of contracting diseases like whooping cough and measles if it isn't done on time.
"There are a range of issues why people on very low incomes struggle to get access to healthcare services. Anything that can reduce this barrier for our children is absolutely worth trying."
Babies who are overdue for immunisations and have been recalled numerous times are eligible.
Dr Turner says making vaccinations compulsory won't solve the problem of late immunisations, because it's not easy for families living in poverty to access even free healthcare.
"With all the other strains and challenges in their lives, to just say 'do it' is not a simple, easy answer."
Auckland is currently in the midst of a measles outbreak. The World Health Organization has named anti-vaxxers one of the top 10 threats to global health.