It clearly failed on context there - "fällig" does mean "due", but when referring to an invoice. "due" isn't used for baby delivery dates in German, the sentenc

It clearly failed on context there - "fällig" does mean "due", but when referring to an invoice. "due" isn't used for baby delivery dates in German, the sentence would be structured differently, probably something like "Unser Baby kommt im Januar" (literally "our baby is coming in January"). That's exactly the kind of thing I hoped this new model would catch, but apparently that's still a bit too much to expect.