Complications for infants include pneumonia, convulsions, and in rare cases, brain damage or death. Most of these babies are contracting it from older siblings or adults. Many cases occur in adults because protection from the vaccine only lasts five to 10 years after the last dose. The vaccination against pertussis is included in the DTP and DTaP vaccines. It's very important that children receive their vaccines on time and stay on schedule.
Children can receive shots even when they have a cold or are taking antibiotics.
There are very few real reasons to delay giving babies their immunizations.