Hi Claire,
we've travelled lots with our little one but never without her. We are actually planning on taking a trip without her in February for almost a week and leaving her with her grandparents and I am totally nervous about it. I think this is normal for every parent!! She's done overnight and weekend stays at grandma and grandpa's but never more than 2 days. I think your doctor is right..it is separation anxiety for us..not them.
I guess the key is being prepared. My sister travels a lot w/o her kids (and with her kids too!) and some things that I know she does when she leaves them in s/o else's care are:
1) make sure that your caregiver has key emergency contact numbers which are cleary posted in their house and also in diaper bag. Not just your own contact info at your destination & cell phone etc - but also pediatrician's #, local emergency department of hospital, poison control, telehealth, etc
2) leave health card or photocopy of health card (copy in diaper bag)
3) leave letter authorizing caregiver to accompany and act as caregiver in event of urgent or emergent health care problem (also include your contact info on the letter saying that you want to be notified immediately and prior to any decisions) - copy in diaper bag
4) if any meds ever need to be administered, clearly right out instructions and proper dosing
I also think doing what you can to make the caregiver's life easier helps them but also you sleep easier at night. For example:
-pre-install all car-seats in their vehicle and make sure they know how to put your baby/toddler in correctly,
-type out a schedule of a typical day and examples of foods they like or can't eat (allergies, food restrictions),
-help them baby proof their home with plug outlets, gates, etc.
Hope this is helpful.
Sugy.