There is a special support list for parents of children with Hepatitis B. It is a special group within the Hepatitis B information and Support list (http://hblist.org/)
http://health.groups.yahoo.com/group/hbv-adoption/join
Good luck!
if infected at birth he should have a normal life, just monitor liver damage by fibroscan and hbsag quantity, if hbsag has got lower by interferon keep therapy for 1-2years and then discontinue and follow hbsag
interferon can be made several times if hbsag gets lower and eradicaed by second or third try
never start antivirals like tenofovir or entecavir they will be useful only when liver damage gets adavnaced or after 35-40yo, only immune modulators like interferon are ok