What is the best and least harmful Sharia solution for a fetus conceived through zina: to abort it before the soul is breathed into it, or after if it has been breathed into it, or to let it be born and then leave it in front of mosques, houses or charities?

The two fornicators must repent to Allah for this grave sin. It is not permissible to abort the fetus; abortion is forbidden at all its stages. If the mother gives birth to it, it is her child, and she bears responsibility for it. It is not permissible to leave it in front of mosques or houses. One must repent and fulfill the child's rights, for neglecting its rights is another sin that is not justified by the fear of the shame from the previous sin.