Pro Living Keto The vaccine against three of these diseases does not get a baby until the first birthday (there is no mononucleosis vaccine), but mothers protect the baby against meningococci and pneumococci and Hib bacteria for only 6 to 8 weeks after delivery. However, they do not actually protect - because their concentration in the baby's body decreases rapidly - against influenza , chickenpox (smallpox can even get a month-old baby), as well as tetanus, diphtheria and pertussis (that's why 6 weeks old are vaccinated against these very dangerous three diseases) babies). http://billsschedulechallenge.com/pro-living-keto/