I think the check should ignore the father, simply because he could father a different child every day of the week, every week of the month, every month of the year.
A woman, however - barring multiple births - is unlikely to have had children closer than 7 months apart (also barring the intervention of a miracle - - or "modern" science/medicine - - 5-month, or 6-month babies were most unlikely to survive unless it was a case of the parents pre-empting the wedding by a few months). Baby #1 is born, 7 months later baby #2 is born, maybe 8 months later baby #3 is born (because a mother with a history of early/premature births will most likely always have her babies early). Rare, maybe, but it did sometimes happen.