The 3 phases of classic pertussis, namely catarrhal (1–2 weeks), paroxysmal (2–6 weeks), and convalescent (2–6 weeks), are not typically observed in infants. Neonatal cases tend to present with paroxysmal cough, gagging, bradycardia, gasping, apnea, and cyanotic spells, but not fever and tachypnea. They do not have the characteristic “whoop” due to lack of prolonged inspiratory effort at the end of a paroxysm. Infants <6 months of age tend to have a shorter catarrhal and longer convalescent phase. The following complications may be observed in neonates and young infants with pertussis: