I was reading history of the prophet by Ayatollah Jaffer Subhani and he makes it clear that the prophet had 6 children from Sayida Khadija?

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The general shia opinion is not. Ayatullah Subhani is no doubt a great scholar and one of my teachers. The reason why you don’t hear our centres or mosques talking about other daughters is because not most uphold the view that he had more than fatima as daughter