Abu Hurairah reported,

From the Messenger of Allah ﷺ, he mentioned several hadith, among them that the Messenger of Allah ﷺ said, "Every child is born upon this natural disposition, then his parents make him a Jew or a Christian, just as you breed camels. Do you find any born mutilated until you yourselves mutilate them?"They asked, "Messenger of Allah, what about one who dies young?"He replied, "Allah knows best what they would have done."

Muslim 6760

Sahih

حدثنا محمد بن رافع حدثنا عبد الرزاق حدثنا معمر عن همام بن منبه قال هذا ما

حدثنا أبو هريرة

عن رسول الله ﷺ فذكر أحاديث منها وقال رسول الله ﷺ من يولد يولد على هذه الفطرة فأبواه يهودانه وينصرانه كما تنتجون الإبل فهل تجدون فيها جدعاء حتى تكونوا أنتم تجدعونها قالوا يا رسول الله أفرأيت من يموت صغيرا قال الله أعلم بما كانوا عاملين

مسلم 6760صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Decree
Chapter
Meaning of "every child is born upon fitrah" and the ruling on the death of children of disbelievers and children of Muslims
Numbering
Darussalam 6760
Muslim 6760