Pregnant Mom's Flu Shot Protects Baby, Johns Hopkins University Bloomberg School of Public Health Study Published: Sep 18, 2008 WebMD -- Sept. 17, 2008 -- Pregnant women who get flu shots protect their infants up to age 6 months, a clinical trial shows. Related links Reuters This will open in a new window US News This will open in a new window WebMD This will open in a new window Email this Facebook Twitter LinkedIn Pinterest Reddit Back to news