Is it permissible for a woman to become pregnant while breastfeeding her 19-month-old son, and what is the ruling on her inability to complete breastfeeding in this case, and must she wait to complete the two years of breastfeeding before attempting to conceive?

It is permissible for a man to have sexual intercourse with his breastfeeding wife, and there is no harm in a woman breastfeeding while pregnant, due to what was authentically narrated from the Prophet, peace and blessings be upon him, that he said: "(I intended to forbid al-ghilah, until I remembered that the Romans and Persians do that, and it does not harm their children)." And al-ghilah is a man having sexual intercourse with his breastfeeding wife, or a woman breastfeeding while pregnant. However, the woman should consider her ability to endure that and balance her duty towards the infant with her needs during pregnancy. If she perceives harm, there is no objection to delaying pregnancy.