My 11Mont baby fever is from35days, now admit in hospital. All test of blood, urine, usg, Xray, blood/urine c/s, csf is normal is bone marrow test is require?

Can't say. It is inappropriate for anyone without direct access to the patient, tests & all information to offer an opinion on what should be done. If you are uncomfortable about any part of the care either arrange to talk it out to your satisfaction or arrange a consultant to review the case.