Some areas are experiencing considerably worse rates of infection (Picture: Metro.co.uk)Experts are urging pregnant women to get vaccinated against whooping cough after a rise in potentially deadly cases among babies.Health officials yesterday confirmed five babies died of the disease, also known as pertussis or the ‘100-day cough’, died in the first three months of this year.That period alone saw triple the number of confirmed cases as the whole of last year.Cases have continued to