Her name means "Deserving of God's reward." She is also known as Thuwaybah al-Islamiah.
She was the servant of 'Abd al-'Uzzā ibn 'Abd al-Muṭallib, better known as Abū Lahab. However she was freed by Abū Lahab when she informed him that his brother ('Abdullāh's) wife Āminah had given birth to a son Muḥammad.
Thuwaybah became Muḥammad's first nurse, nursing both him and her own son Masrah. Thuwaybah also nursed Hamza ibn Abd al-Muttalib, Muḥammad's paternal uncle, thus Muḥammad said of Ḥamzah's daughter: "She is the daughter of my nursing brother." 
Thuwaybah became a Muslim when Muḥammad proclaimed prophethood. Her son died before her, and she herself died in 7 AH.
The Shaykh of the Ḥaram - Muḥammad al-'Alawi al-Mālikī in his Al-Dhakā'ir al-Muḥammadiyah writes that the Hadith Master (muḥaddith) Ibn Mundah records Thuwaybah among the Ṣaḥābah.
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