Hi welcome to Healthcare Magic ...
of > 21.5 g/dl is really a matter of concern in a 5 week old baby.
Other disturbing factor is the heamoglobin level of 8.6 g/l .It looks either she is having a heamolytic disorder - i.e blood is getting destroyed in her body(eg:Hereditary Spherocytosis
) or she is loosing blood in her body.So a Peripheral smear , Direct coombs test
would be other priliminary tests to diagnose the cause of hyperbilirubinemia.
Get a pediatrician
consultation , this may be something of concern , needing urgent management.
Please do not delay and take appropriate treatment...
Thank you ...Hope i was helpful.