Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) used to say in his supplication: "A protection like the protection of the infant." Abu Ya'la says: Meaning the (newborn) child; this is how it was explained to us.
Abu Ya'la recorded it; its chain contains a narrator who has not been named, and the rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدعية / 17419