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Approximately 20-25 % of new born baby develop neonatal jaundice
,depending upon many factors.If parents & doctor are alert it is generally detected before the serum bilirubin
is less than 10.& it requires no treatment in majority of cases.If it crosses more than 10 ,photo-therapy alone is sufficient in majority of case.If above 20-25 it requires blood exchange or you can call blood transfusion
.As in you case it was 38 mg % so photo-therapy & blood exchange both were indicated.So doctor hav given you proper & right treatment.
Wish you good health