Hi, we travelled around the world for 6 months, just got back before Xmas, Saskia was 4.5 months when we left, so we crossed a number of time zones. We tried to keep to her routine as much as possible but had it in our minds, "this is a travel day" so didn't get too worked up if the routine went potty, and on the way to the new destination we switched to new time zone as soon as we could. We kept bedtime routine and then the next day started with the new time zone, so woke her at 7-7.30 as usual and started from there. We found it worked better to try and adjust as soon as possible rather than slowly. Actually, she adjusted quicker than I did!!