I went grocery shopping with a newborn and two preschoolers and made it out of the store alive. Matthew decided he was starving just as I was clicking his carseat into the van and screamed all the way home, but I am thankful the screaming didn't start in the checkout line. The groceries didn't get unloaded for a couple of hours after we got home, but I still count the trip as a success.
I realized as I was unloading the groceries that one week postpartum is still too soon to lift heavy things. Ouch.