Musannaf Ibn Abi Shayba 3:2303

Waki’ narrated to us, from Sufyan, from Abu al-Sawda’ al-Nahdi, from Ibn Sabit, that the Messenger of Allah (may Allah bless him and grant him peace) recited in the first rak'ah a surah of about sixty verses. He then heard the crying of an infant, so he recited in the second [rak'ah] three verses.