"Symptoms start with a runny nose, fever and dry cough. Coughing gets worse over the next few weeks developing into attacks of coughing and sometimes vomiting," Miller said.
The 'whoop' sound occurs as a baby draws a breath after a long coughing attack and babies under 1 are most at risk of serious complications from whooping cough.
The most effective way to protect babies is for their mother to be immunised during pregnancy, between 28 and 38 weeks, so that antibodies are passed on to the baby. These antibodies will help reduce the likelihood of the baby becoming ill with whooping cough before their first immunisation at 6 weeks.
"It is really important that babies get that first immunisation on time. Further childhood immunisations are required at 3 months, 5 months, 4 years and 11 years to ensure ongoing protection."
In addition to the national rise in whooping cough cases, Mumps is also more common this year.
Since September 2016 there have been more than 1000 cases of mumps reported in New Zealand.
While most of these cases have been in the Auckland region, holiday travel increases the likelihood of mumps spreading to other parts of the country.
"It's also really important to check your immunisation status with your GP or practice nurse before traveling abroad and book in a vaccination if required," Miller said.
Mumps is infectious, and spreads from person to person by coughing and sneezing, or through contact with infected saliva. Symptoms appear about two to three weeks after coming into contact with someone with mumps.
Miller said vaccination was the best protection against mumps.
"If you or your children have not had the recommended two MMR (Measles, Mumps, and Rubella) vaccinations, we strongly recommend that you get these up to date. MMR is recommended and free for anyone born after January 1 1969 and is given to children at 15 months and again at 4 years of age.
If you think you may have whooping cough or mumps, phone Healthline on 0800 611 116 for free advice, or see your GP.
If you're not sure if you or your family are up to date with immunisations, please contact your family doctor to check.
For more information visit www.toiteora.govt.nz/whooping_cough and www.immune.org.nz/diseases/mumps