A child's urine does not invalidate the ablution, but it must be washed off
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Question 17 of Fatwa No. (6505)
Q7: I performed ablution for prayer and carried a child who soiled my clothes with urine. I washed the area where the urine hit and prayed without renewing my ablution. Is my prayer valid?
A7: Praise be to Allah alone, and may peace and blessings be upon His Messenger, his family, and his Companions... To proceed: Your prayer is valid; because the child's urine that reached you does not invalidate the ablution, but it is obligatory to wash what reached you from it. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q7: I performed ablution for prayer and carried a child who soiled my clothes with urine. I washed the area where the urine hit and prayed without renewing my ablution. Is my prayer valid?
A7: Praise be to Allah alone, and may peace and blessings be upon His Messenger, his family, and his Companions... To proceed: Your prayer is valid; because the child's urine that reached you does not invalidate the ablution, but it is obligatory to wash what reached you from it. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.