Your baby will get a shot called DTaP that will prevent diphtheria, tetanus, and pertussis (also known as whooping cough) all in one. Three doses of this shot are given in the first year: at 2, 4, and 6 months. It is important to get all three doses to give your baby the best protection. 

Diphtheria is a disease that causes a thick covering in the back of the throat. It can lead to breathing problems, heart failure, paralysis, and can be life-threatening. Tetanus (also called lockjaw) is a life-threatening disease that causes painful tightening of muscles all over the body. Whooping cough is a very contagious respiratory infection that can be serious in babies. 

Visit the CDC for more information about the DTaP vaccination and the diseases it prevents.