Different articles cite different numbers and the totals can be confusing. This article and chart are designed to clarify the vaccine schedule and explain why the numbers may not always "add up." To be accurate, wording about total numbers of vaccines should include phrases like, "may receive up to" or "typically" or "between X and Y" number of vaccines. The individual numbers for any given child will vary depending on the specific vaccines used in his pediatrician's practice or clinic.
To start, there is a difference between the number of vaccines given and the number of antigens given. According to the National Cancer Institute, an antigen is: