Hi! So, have you had periods yet? When I exclusively breast fed, I got no period until I began weaning. I found that the beginning of getting my period was like irregular periods and coincided with reduced milk. But you are describing being late? Or not having a period and just spotting? That's actually really common when you travel. Any disruption in routine can throw your period off. It could be related to changes going on with sometimes bottle feeding but probably it is due to the travel.