The 'Awrah of an Infant
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If a woman touches the 'awrah of an infant, does this invalidate her ablution?
Response: This does not invalidate the ablution of the woman - if she washed her child and touched his private parts. Even if a man touched his private parts, this does not invalidate his ablution unless he did so with desire. If however he did so without desire, then [renewing the] ablution is recommended but not obligatory.
Shaykh Ibn 'Uthaymeen
I'laam al-Mu'aasireen bi-Fataawa Ibn 'Uthaymeen - Page 38