It is narrated from Sayyiduna Safwan bin Umayyah in a marfu’ form that dying from the disease of plague, or from a stomach illness, or by drowning, or in the state of postnatal bleeding, is also martyrdom.
Hadith Referenceمسند احمد / مسند المكيين / 15307
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف لجهالة عامر بن مالك