AbuJubair bin Hayyah narrated that he heard Mughirah bin Shu'bahsay:
"I heard the Messenger of Allah (ﷺ) say: 'The (funeral) prayershould be offered for a child.'" (FR)
English reference (FR): Vol. 1, Book 6, Hadith 1507 (FR)
Arabic reference (FR): Book 6, Hadith 1574 (FR)