The normal pertussis vaccine is part of a combination vaccine that also covers diphtheria and tetanus, commonly known as the DTaP vaccine. It is generally administered starting at three months of age. If not vaccinated, it's usually due to illness or other factors; however, catch-up vaccination is possible to effectively generate antibodies. Following the prescribed vaccination schedule can effectively prevent pertussis, a contagious disease. It is important to remain calm and have a correct understanding. Regularly schedule vaccinations for your baby according to the vaccination course. Additionally, ensure the baby gets plenty of sunlight and regularly check growth parameters such as height and weight.