How can one deal with a pregnancy resulting from adultery and the birth of a baby girl from it, while feeling guilty towards the husband and children, and the impact of this on the mother's relationship with the baby? And is the husband considered the legal father of the baby girl through breastfeeding, by analogy with the ruling on breastfeeding? And what is the ruling on the husband's brother interacting with the child when she grows up?

It is advisable to strive to ease the matter and engage in frequent remembrance of Allah so that hearts may find tranquility. Perhaps consulting a psychiatrist, while maintaining privacy, would be beneficial. Remember sincere repentance and that Allah has opened doors of goodness for you through this sin. You must repent from your resolve to abort, and praise Allah that it was not carried out. Legally, your daughter is your husband's daughter, and his brothers are her paternal uncles. Do not surrender to intrusive thoughts, and seek refuge with Allah from Satan. Be sincere in your supplication. Never tell your husband what happened, resume your life with him, and strive to deal with the child naturally.