I wouldn't. I knew of a case where a child (older than 6) was left alone in the car while their parent went into a building for several minutes, and in that time frame, the child had strangulated in a seatbelt and suffered permanent, severe brain damage. Someone passing by saw the child, disentangled them, and began CPR - this means the door must have been unlocked, so if the child had been left in a locked car, they might have died.
I also witnessed the aftermath of a child knocking a car into gear at my elementary school. The car ran into a soccer goalpost and was stopped in a ditch right in front of a busy main road.
There are just too many things that could go wrong.








lol I am one of the most paranoid people on the planet so I can relate and I hope you take no offense at me saying that!
I just get worried about getting carjacked or something! When possible I get my husband to put gas in that car--we share both cars, and I figure he's less of a vulnerable figure--or I do it on something like an evening supermarket run when he's home with the kid. As for the shopping cart thing, putting her in the cart seat is relatively new to us since she has only been able to sit up in the past month or so, so we're still figuring that out. But typically we don't buy that many groceries for just 2 adults so it's not a big deal to keep one hand on her while unloading 1 or 2 bags worth of groceries. And she's too little to climb out. As she gets bigger, we'll see how it goes.

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