Praise be to Allah.
No scholar has said that breastfeeding a child is one of the things that invalidate wudu. The things that invalidate wudu are defined and limited, and have been explained in the answer to question no. 14321 .
The scholars are unanimously agreed that anything that comes out of a site other than the front or back passages does not invalidate wudu if it is tahir (pure) , but they differed concerning that which comes out of the body if it is najis (impure), as to whether it invalidates wudu or not.
This has been discussed in detail in the answer to question no. 45666 . (Al-Mawsu’ah al-Fiqhiyyah, 17/111)
For more, please see these answers: 20330 , 12801 , 82759 , 8531 , 21242 , and 191686 .
And Allah knows best.
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