Sunan an Nasai
2663
Sahih+2

It was narrated from Asma bin 'Umais that:she gave birth to Muhammad bin Abi Bakr As-Siddiq in Al-Baida, Abu Bakr told the Messenger of Allah about that, and he said: "Tell her to perform Gusl then begin the Talbiyah

SahihAbu Ghuddah
SahihAl-Albani