So if they’ve just picked up active Hepatitis in the birth canal, the best thing for them is to inject with a bunch of the same, albeit deactivated, virus?
Yes, it very well may be the best thing:
“If a person who has been exposed to Hepatitis B virus gets the Hepatitis B vaccine and/or a shot called “HBIG” (Hepatitis B immune globulin) within 24 hours, Hepatitis B infection may be prevented.”
http://www.cdc.gov/hepatitis/B/bFAQ.htm#transmission