You probably have done hb electrophoresis or hplc for detection of Thalassemia
. First of all the Thalassemia generally presents at the age of 5-6 months of age. The one and half month is not the age to suspect Thalassemia. Also the tests for detection of Thalassemia should be done after one year of age of baby. The test result that you mentioned can tell neither presence nor absence of thalassemia at this age. Need to know whether the baby is growing properly or not and feeding properly or not. If required, the Thalassemia screening tests can be done for parents to know whether they are carrier or not. For confirmation of diagnosis at the early age one may go for genetic testing for thalassemia. Hope it helps.