I can't help you there. To me, I see not vaxing as linked to not formula feeding. The baby's gut is a vital part of the immune system, and the guts of breast fed babies are different than the guts of formula fed babies. I have a supportive family doc who is in total agreement that baby is generally protected, especially against pheumoccocal and Hib from breast milk. Some nights, when I feel exhausted from marathon breast feeding, I think about switching to formula, then I realize I would have to rethink my who approach to medical care. I probably would selectively vax if I weren't practicing exclusive breastfeeding. However, regarding Hib, there are actually very few cases of Hib in the U.S. now (not sure of the exact number). So, you would not be taking a huge risk to skip it, especially if the babe is past the age where meningitis is a big risk. Good luck!