I hadn't thought about this yet.
I guess because at this stage i don't even take my bag in, will quite often leave my phone bag everything in the car with the windows wound down during summer hehe yeah i know real security conscious.
What I probably will do as I have an alarm that immobilises itself after 45seconds is alarm the car silently especially if bubs is sleeping as i don't want the beep to wake baby up. DP wants to tint my car as well as I have the sedan and he has the 3door hatch (so glad it wasn't the other way round).
If it was his car well he would probably leave baby in the car, but then bubs would have to be in the back and how much time would that take to get baby outta the back of a hatchback for a five second trip to the counter.
I'm already in the habit of not stopping when its busy as I'm too impatient anyways, and not stopping when its rush hour traffic as i cant be naffed trying to get back into the traffic flow afterwards