(6) بَاب مَعْنَى كُلِّ مَوْلُودٍ يُولَدُ عَلَى الْفِطْرَةِ وَحُكْمِ مَوْتِ أَطْفَالِ الْكُفَّارِ وَأَطْفَالِ الْمُسْلِمِينَ
'A'isha, the mother of the believers, reported that a child died and I said:
There is happiness for this child who is a bird from amongst the birds of Paradise. Thereupon Allah's Messenger (ﷺ) said: Don't you know that Allah created the Paradise and He created the Hell and He created the dwellers for this (Paradise) and the denizens for this (Hell)?
Reference: Sahih Muslim 2662 b
In-book reference: Book 46, Hadith 46
USC-MSA web (English) reference(deprecated numbering scheme): Book 33, Hadith 6435