thebabyconnection,
Congratulations on the baby, and the weight loss!

I can understand your situation, for when I have an opportunity to spend time away,I don't really want to feel guilty over eating, period. So, if I am hungry, I eat, and I eat what I like, if I happen to eat a bit more from what I know I really needed, I do not beat myself up over it anymore, try not to anyway.
I just acknowledge it, and make it a point to eat less next time.
For many years I have been an advocate for eating what you like, if you are hungry, and eat until your stomach is comfortable, not stuffed, I personally do not like that stuffed feeling, (ugh)sometimes I will use a smaller plate, and often I do measure my food, not always. Typically in the morning with my cereal, otherwise I might eat half the box!

which if it was just the box....

and I am working on (once again) to get more exercise. Nothing major, just more walking.
For a long time now, depending upon which shoes I am wearing (seriously) or if it is raining, I will park in the back 40 of a parking lot, when shopping.
I realize that it is probably not so doable, with baby in tote. When junior is older though he or she I believe will like the walk. Personally I think it is best for people with small children to park closer, for safety issues, so when alone, get in those extra steps. I don't worry so much for myself, as I do others, especially those that have babies, or young children, for there are a lot of weirdos out there.( I don't mean to scare )