No, wudu (ablution) is not invalidated by cleaning a child’s urine, changing their diaper, or touching impurity (najasah). Touching impurity is not a nullifier of wudu. However, it is obligatory to wash the impurity off one's hands or affected areas before performing Salah (prayer).
In the name of Allah, the Most Gracious, the Most Merciful.
All praise is due to Allah, and blessings and peace be upon the Messenger of Allah ﷺ.
The established ruling in Islamic jurisprudence is that contact with impure substances—such as urine, poop, or blood—does not break one's wudu. The nullifiers of wudu are specific (such as passing wind, urination, defecation, etc.), and touching filth is not among them.
1. The Ruling on Touching Impurity
The Standing Committee for Scholarly Research and Ifta (Al-Lajnah Ad-Da’imah) has stated:
Shaykh Abd al-Aziz ibn Baz (رحمة الله عليه) further clarified this matter, distinguishing between the validity of wudu and the requirement to be physically clean for prayer:
He also addressed the specific scenario of handling a child's clothes:
2. Touching the Child's Private Parts
Sometimes, whilst cleaning a child, one may touch their private parts. Does this specific act invalidate wudu?
Shaykh Muhammad ibn Salih al-Uthaymin (رحمة الله عليه) ruled that this does not break wudu, as the prohibition applies to touching the private part with desire (shahwah), which is absent in this context. He stated:
Conclusion: If you change a diaper or clean a child:
And Allah knows best.