I understood your answer..but why do you call the death of Bibi Sakina, a natural death? she also was part of oppression of karbala , kept thirsty, beaten, and then she died , so isnt her death a martyrdom? isnt it wrong to think that a 4 year old baby just die naturally ?

In reality every momin is shaheed as the Hadith mentions, but she was not executed or poisoned.