My mum left me at home asleep in my cot during the day when I was about 18 months I think, possibly it was to pick up my brother from kinder.
She was pregnant and in a minor car accident while she was out so she had to ring the neighbour and get him to go and look after me. (Which leads me to believe she probably didn't lock the house either). Oh, the 1970s!
And when our other neighbour was minding my brother once when he was a baby she needed to go to the shops so she sat his bouncy chair (bouncinette?) on the drivers seat with a seat belt around it. Good lord!
My friend's mum also used to leave her asleep in her cot while she walked up the street for kinder pickup.
Times have changed!