The 'whoop' sound occurred as a baby drew a breath after a long coughing attack.
Babies under 1-year-old were at the most risk of serious complications from the illness such as pneumonia and brain damage.
Pregnant women could get a whooping cough booster vaccination free between 28 and 38 weeks of pregnancy.
This was the time she could pass her immunity on to the baby, helping protect them until they were old enough to be vaccinated against whooping cough themselves as part of their free childhood immunisation at 6 weeks, 3 months and 5 months old.
Mr Shoemack said as children have now gone back to school and preschool, it was a good time to check if family was up to date with immunisations.
With three children and one on the way, Tauranga mother Jamie-Lee MacInnes said it was a no brainer to get the free whooping cough booster.
"All my kids have been immunised, my daughter Aneeqah had her shots last week and now it's my turn."
Ms MacInnes had her vaccination through immunisation services provided by the Western Bay of Plenty Primary Health Organisation.
Immunisation coordinator Diane Newland said women should talk to their GP about the Boostrix vaccine and when the right time to have it.
"Staff should also be able to talk about immunisations for your baby and the importance of getting these on time."
Whooping cough - If babies catch whooping cough they may not be able to feed or breathe properly - May become so ill they need to go to hospital - Could end up with serious complications such as pneumonia or brain damage