Is there sin incurred by the grandmother who pulled the head of the deceased fetus during difficult labor, and what is the expiation for that, if it is obligatory, knowing that she was ignorant of the correct action at that time?

The detailed ruling on this matter falls into one of three scenarios:

1. If doctors state that the child's death was natural due to difficult childbirth: The grandmother bears no liability, no sin, no blood money (diyyah), and no expiation (kaffarah).

2. If doctors are uncertain and cannot determine the cause of death: The grandmother is not obligated to do anything, as the default is the exoneration of liability.

3. If doctors predominantly believe that the cause of death was a medical error during the delivery process (pulling the head, leading to suffocation): This is considered accidental killing (qatl khata'), and the grandmother must perform sincere repentance (tawbah nasuh), fast for two consecutive months as expiation, and pay blood money (diyyah) to the fetus's heirs, unless they forgive her. This is based on the Prophet, peace and blessings be upon him, who said: "Whoever practices medicine without being known to be a physician is liable."

In summary, it is necessary to consult specialist doctors. If the likelihood of error on the part of the grandmother is predominant, then compensation (blood money and expiation) is obligatory; otherwise, nothing is incumbent upon her.