That the Messenger of Allah ﷺ said: "The boy is mortgaged by his 'Aqiqah; slaughtering should be done for him on the seventh day, he should be given a name, and his head should be shaved."  

قَالَ رَسُولُ اللَّهِ ﷺ الْغُلاَمُ مُرْتَهَنٌ بِعَقِيقَتِهِ يُذْبَحُ عَنْهُ يَوْمَ السَّابِعِ وَيُسَمَّى وَيُحْلَقُ رَأْسُهُ  

Another chain with similar meaning.  

عَنِ النَّبِيِّ ﷺ نَحْوَهُ