Asma daughther of 'Umais gave birth to Muhammad bin Abi Bakr at Shajarah. The Messenger of Allah (ﷺ) commanded Abu Bakr to ask her to take a bath and wear ihram.
Sunan Abi Dawud Book 11, Hadith 23
← Previous Hadith I came to the Messenger of Allah (ﷺ) when he was at Mina, or at Arafat. He was surrounded by the people. When the bedouins came and saw his face, they would say: This is a blessed face. He said: He (the Prophet) appointed Dhat Irq as the place of putting on ihram for the people of Iraq.

Sunan Abi Dawud Book 11, Hadith 22 Next Hadith → The Prophet (ﷺ) said: A menstruating woman and the one who delivered a child should take a bath, put on ihram and perform all the rites of hajj except circumambulation of the House (Ka'bah) when they came to the place of wearing ihram.

Abu Ma'mar said in his version: "till she is purified". The narrator Ibn Isa did not mention the names of Ikrimah and Mujahid, but he said: from Ata on the authority of Ibn Abbas. Ibn Isa also did not mention the word "all (rites of hajj)." He said in his version: All the rites of hajj except circumambulation of the House (the Ka'bah).

Sunan Abi Dawud Book 11, Hadith 24