Immunizations are supposed to follow CDC guidelines, and can be adjusted in the School Settings section if needed for the center, however some centers have noticed the the Due Dates do not follow CDC Guidelines as linked in our Help Center Article on this. I just think it is important to make sure the due dates, like DTaP, do match the guidelines as we say they do. Attached screenshots of an 11 month old student who is saying his 4th dose is overdue from Aug, when he would have been 9 months old, however the CDC guidelines say 4th dose shouldn't happen until the 15-19th month.