Imam Abu al-'Abbas Ahmad ibn Idris al-Shanhaji al-Qarāfi (d. 684 AH) said:
'A'ishah breastfed an adult male, making him mahram (in marriage) to her. If it were forbidden, she would not have done so, and none of the Companions objected to her action.
Al-Furuq: Anwār al-Buruq fi Anwa al-Furuq, Vol.3, Pg.386.