I left my new baby in his pram outside a shop and only remembered him when I was halfway home. In my defence, 40 years ago you weren't allowed to take prams or pushchairs into shops so you had the choice of carrying (possibly waking) the baby into the shop or leaving him in the street. I don't think we worried about stranger danger and the only bad experience I ever heard of was when a friend's unweaned baby was given a sweet by a misguided shopper. The baby was perfectly fine, luckily. Thinking of the other restrictions on activity then, do you remember the nightmare of folding the pushchair - buggies only just invented - then getting it one-handed onto the bus or train while carrying the baby and shepherding the toddler? Then heaving it onto the luggage rack or getting it into the luggage bay. No reserved areas for people with pushchairs and children. And children were regularly left outside pubs, sometimes for hours, with a packet of crisps and a drink! But I can perfectly understand how the Camerons came to leave their daughter behind; she went to the loo, there were a lot of adults and children in the party. Not very traumatic or a big deal.