That his father said: "I saw the Messenger of Allah ﷺ say the Adhan in the ear of Al-Hasan bin 'Ali - when he was born to Fatimah - the Adhan of Salat."  

رَأَيْتُ رَسُولَ اللَّهِ ﷺ أَذَّنَ فِي أُذُنِ الْحَسَنِ بْنِ عَلِيٍّ حِينَ وَلَدَتْهُ فَاطِمَةُ بِالصَّلاَةِ  

That the Messenger of Allah ﷺ said: "For a boy, there is an 'Aqiqah. So spill blood for him and remove the harm from him."  

قَالَ رَسُولُ اللَّهِ ﷺ مَعَ الْغُلاَمِ عَقِيقَةٌ فَأَهْرِيقُوا عَنْهُ دَمًا وَأَمِيطُوا عَنْهُ الأَذَى  

Another chain with similar.  

عَنِ النَّبِيِّ ﷺ مِثْلَهُ  

That she asked the Messenger of Allah ﷺ about the 'Aqiqah. He said: "For the boy is two sheep, and for the girl is one, it will not harm you if they (i.e. the sheep) are male or female."  

أَنَّهَا سَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنِ الْعَقِيقَةِ فَقَالَ عَنِ الْغُلاَمِ شَاتَانِ وَعَنِ الْجَارِيَةِ وَاحِدَةٌ وَلاَ يَضُرُّكُمْ ذُكْرَانًا كُنَّ أَمْ إِنَاثًا