Is a divorce effected by the words “Enough, this is enough for me, what was between us is over,” with the intention of divorce and the wife’s understanding of that? And in this case, would the newborn truly be considered the husband’s rightful child, despite positive custody laws? And what do you advise for dealing with a disobedient wife who withholds herself?

This statement of yours is an allusive utterance that implies divorce. An allusive utterance, when accompanied by intention, brings about divorce. Therefore, you have divorced your wife. If you have not completed three divorces, you may take back your wife before the expiration of her waiting period (iddah). If you do not take back your wife and she becomes irrevocably separated from you, then the custody of the young child belongs to her, unless there is an impediment to her custody. In case of dispute regarding custody matters, recourse should be made to the Sharia court for resolution.