Is it allowed to suck once wife breasts even if she is lactating and during sucking if some milk comes in his mouth but he soon spit it out is it allowed or not?

If a person has full conviction that by him sucking the breast of his wife, milk will not come out, then it would be permissible to suck it. (Shaami Vol.3 Pg.225, Imdaadul Mufteen Pg.604)

If there is a possibility of milk coming out, then sucking it would not be allowed. (Fatawa Mahmoodiyyah Vol.12 Pg.311, Khairul Fatawa Vol.4 Pg.488)

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai