The ending of the story (or last sentence) is ambiguous but it is possible that the ‘issue’ is who will have the baby and not what will happen the parent’s relationship, which appears to be over, with no reconciliation in sight. And the ‘manner’ to which the ‘issue’ is resolved may be the continued fighting (between the parents) over the baby, which in all likelihood may have caused an injury (if not worse) to the baby.