Yasir Qadhi writes:
Other scholarly opinions include: 9th of Rabīʿ al-Awwal; 17th of Rabīʿ al-Awwal; 22th of Rabīʿ al-Awwal; and that he was born in Ramadan. There are over ten opinions within the earliest sources of Islam regarding the exact day the Prophet was born, with no clear cut, indisputable certainty.