Is the ablution of a woman invalidated if she changes her son’s nappy who is three years old and washes him?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

Changing the baby’s nappy and washing him does not invalidate ablution, that is because ablution is only invalidated by its real nullifiers, that is anything that comes out of the front and back passages like urine and excrements, or another nullifiers which invalidate ablution, like touching the private parts, loosing one’s consciousness, and the like.

Washing an impurity or touching it is not one of the nullifiers of ablution. 

Allaah Knows best.