How many daughters did Imam al-Hussein (as) have? Is it true that he left one of his daughters named Fatima in Madina while going to Karbala?
Regarding whether he had a daughter named Fatima in Madina, there is some discussion here: https://www.al-islam.org/ask/what-information-is-available-on-the-life-o...
Historians do not agree on how many children Imam Husain had. However, this is a good summary of what various authors have said: https://en.wikishia.net/view/Imam_al-Husayn_b._%27Ali_(a)#Wives_and_Children
Hope that helps - history is a challenging subject!