Sahih Muslim | Book 7 | Chapter 15

Narrated by 'Aisha (Allah be pleased with her)
'Aisha (Allah be pleased with her) reported that Asma' hint 'Umais gave birth to Muhammad b Abu Bakr near Dhu'I-Hulaifa. The Messenger of Allah (may peace be upon him) commanded Abu Bakr to convey to her that she should take a bath and then enter into the state of Ihram.

Narrated by Jabir b. Abdullah (Allah be pleased with them)
Jabir b. Abdullah (Allah be pleased with them) reported that when Asma' hint Umais gave birth (to a child) in Dhu'I-Hulaifa. Allah's Messenger (may peace be upon him) commanded Abyl Bakr (to convey to her) that she should take a bath and enter Into the state of Ihram.