Is it permissible for a husband to drink his wife's milk, and does the wife have the right to prevent him if it will affect her child's breastfeeding?

It is permissible for a husband to enjoy his wife by suckling her breast. If milk is discharged and reaches his stomach, there is no harm in it, and it does not affect the validity of the marriage. However, a husband deliberately drinking his wife's milk is considered a departure from natural disposition (fitra). Hanafī jurists have stipulated that this is disliked (makrooh), and the wife should advise her husband to abandon it. Some scholars hold the view that adult suckling (rada' al-kabeer) establishes a prohibited degree of relationship (mahramiyya), so it is more cautious to avoid it.