Hadithcore
Mishkat al-Masabih, 4157

Abu Rafi' told th at he saw God's messenger uttering the call to prayer in the ear of al-Hasan b. ‘Ali when Fatima gave birth to him. Tirmidhi and Abu Dawud transmitted it, Tirmidhi saying this is a <i>hasan sahih</i> tradition.

وَعَن أبي رافعٍ قَالَ: رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أذَّنَ فِي أُذُنِ الحسنِ ابنِ عليٍّ حِينَ وَلَدَتْهُ فَاطِمَةُ بِالصَّلَاةِ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ. وَقَالَ التِّرْمِذِيُّ: هَذَا حَيْثُ حسن صَحِيح

References1 variant
In-Book Reference
Book 20, Hadith 92