Sa'id bin al-Musayyab (may Allah have mercy on him) narrates that Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) said: Offer the funeral prayer over your children, for indeed they are the most deserving of those over whom you offer the funeral prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6786