Hi,
Just thought I'd share my 3 week experience (!)of being out and about and using EASY.
My DS is 13 weeks today, and we are out about 4 - 5 days out of 7 each week, even if it's just a short shopping trip. WHat I usually do, whenever possible, is to plan for him to be somewhere appropriate for each stage of EASY. EG If it's feed time, I plan to be somewhere where I can breastfeed comfortably, other wise I'll take a bottle of EBM (occasionally formula). That might be at mums & tots, a friend's house, etc. Same with sleep time, though I have found that now DS is settled into the routine, he tends to just grouch for a couple of minutes and fall asleep at the right time anyway. If we're out during activity time, whatever we're doing usually counts as the activity.
I recently had to travel a long distance for a family funeral, and anticipated that the routine would go right out of the window. I was really surprised when DS just went ahead and did his routine anyway, right down to feeding in the church (EBM) and playing/ napping at the wake afterwards. He also slept very well in the car that day!
If we have a couple of busy days, I usually stay home for a day (sometimes two if being busy has overstimulated him too much) to give us both chance to chill out. I personally am usually ready for a quiet day by then, but I know from past experience that it isn't as easy when suffering from depression, especially if it makes you feel house-bound.
All I can say is I've noticed every week that it gets easier to manage being out and about, and as our babies get older, they cope with being out and about better anyway.
Good luck with it...hope you manage to avoid the PPD
Mama