It is narrated from Sa'id bin Abi Sadaqah (may Allah have mercy on him) that he said: I asked Muhammad bin Sirin (may Allah have mercy on him) about this hadith, "Every child that is born is born upon the fitrah (the natural disposition of the true religion)": whose saying is it? He replied: "It is the saying of the blessed one (the Messenger of Allah (peace and blessings be upon him)) who knew this truth completely."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الإيمان والتوحيد / 2972
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :رجاله ثقات. » «انفرد به المصنف من هذا الطريق»