The Messenger is not the Father of any Man

Allah states:

﴿مَّا كَانَ مُحَمَّدٌ أَبَآ أَحَدٍ مّن رِّجَالِكُمْ﴾

(Muhammad is not the father of any of your men,) After this it was not permitted to say Zayd bin Muhammad, i.e., he was not his father even though he had adopted him. No male child of the Prophet lived until puberty. Khadijah, may Allah be pleased with her, bore him Al-Qasim, At-Tayyib and At-Tahir, but they died in childhood. Mariyah Al-Qibtiyyah bore him Ibrahim, but he also died in infancy. He also had four daughters from Khadijah: Zaynab, Ruqayyah, Umm Kulthum and Fatimah, may Allah be pleased with them all. Three of them died during his lifetime, Fatimah lived long enough to be bereaved of him, then she died six months later.