Does a husband sucking his wife's breast after childbirth make the newborn a brother to the husband through rada’a (nursing)?

There is no harm in a husband enjoying suckling his wife's breast. The milk that enters his stomach unintentionally does no harm. The same applies if he intentionally suckles, because the preponderant opinion is that adult suckling does not establish a prohibitive kinship (mahramiyyah), and this is the view of the majority of scholars, and it has no consequences. However, it is more cautious to avoid adult suckling to avoid the difference of opinion of those who hold it to be prohibited.