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I just found this handy site. It has an audio recording of a baby with whooping cough so that parents know what it sounds like.

http://www.doitforyourbaby.com/mediaplayer.html

Call your doctor if you hear that.

More about whooping cough:

"Whooping cough — or pertussis — is an infection of the respiratory system caused by the bacterium Bordetella pertussis (or B. pertussis). It's characterized by severe coughing spells that end in a "whooping" sound when the person breathes in. Before a vaccine was available, pertussis killed 5,000 to 10,000 people in the United States each year. Now, the pertussis vaccine has reduced the annual number of deaths to less than 30.

But in recent years, the number of cases has started to rise. By 2004, the number of whooping cough cases spiked past 25,000, the highest level it's been since the 1950s. It's mainly affected infants younger than 6 months old before they're adequately protected by immunizations, and kids 11 to 18 years old whose immunity has faded."
http://kidshealth.org/parent/infections/lung/whooping_cough.html

or http://www.doitforyourbaby.com/learn_about_pertussis.html

Immunization schedule: http://kidshealth.org/parent/growth/medical/immunization_chart.html