Sahih Muslim 6758
صحيح مسلم#6758SahihAbu Huraira reported Allah's Messenger (ﷺ) as saying:No child is born but upon Fitra. He then said. Recite: The nature made by Allah in which He created man, there is no altering of Allah's nature; that is the right religion
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 46:36