According to Hale's 12th edition, the Yellow Fever Vaccine is L3 if baby is
>6 months, and L4 if baby is <6 months. 

"Persons aged >9 months who are travelling to or living in areas of South
Africa where yellow fever is officially reported should be vaccinated. The
CDC recommends that due to certain risks, that breastfeeding mothers not be
vaccinated unless they are entering regions of high risk. The vaccine is a
live attenuated vaccine so there is significant risk that the infant will
ingest some virus, although its infectivity is in question at this time." 

"...If the infant is >6 months, and the mother is entering a region of high
risk for infection, then at least the mother, and perhaps the infant should
be immunized directly."

"Pediatric concerns: None reported yet, but some risk exists as this is a
live-attenuated viral vaccine. Risks in infants and children can be severe
and include: vaccine induced encephalitis, most of which have occurred in
infants <4 months of age (n=14), and in children >3 years (n=7). But none of
these were from infection via human milk."

http://www.cdc.gov/vaccines/vpd-vac/yf/default.htm

The above link is to info on yellow fever vaccination from the CDC.

Fleur Bickford RN, LLLL
Ontario, Canada

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