Unbuckled!
After a long day out, I nursed my daughter and put her back in her carseat (part of the travel system). I apparently forgot to buckle her back in because she was unbuckled when we got home–after at least 20 minutes in the car. I felt so terrible, but at least nothing happened and she was too small to flip herself out or anything! Apparently this is more common than people realize. Many friends have admitted to doing the same thing.