well if going west to NZ....I think routes to WashDC or Chicago would be over 8hr flight from London...so you could stay a night or two in the states...then from there to LAX, from Chicago its 4.5 hrs and WashDC over 5.5 hr....so a night or two in HELL-A. would do justice for the next long haul..then for my suggestion on airline out of LAX, fly the 12hr with AirNewZealand (good service A-1) to Auckland then a commuter flight to ChCh, I think it was 1 hr or so...If you go on the off season to NZ, the plane should be very empty, we flew out of LAX after 9pm and there was plenty of space in the plane(less than half full), and with a baby it may be a little more relieving and the time schedule arriving in NZ is not so shocking. As for the others ??? , sorry .....Good Luck
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