For reasons some posters here are aware of, I have avoided being in 'sole charge' of DSS for any length of time, even though we have shared a home for 2 years.
Today was a bit of a milestone which we've been working up to - I had DD and DSS to myself all day
.
While out first thing this morning buying picnic ingredients, DSS was given a plastic 'gold medal' on a cord at an Olympic themed childrens activity event. to be honest, I didn't really give it much thought. 
It was only while walking home that I realised he'd been twisting the coin round and round and the ribbon was tight around his neck !!!!!!
I was mortified - it's made me realise just how much I take for granted with DD (shes three years older) and how quickly you lose that vigilance as they grow up 
Fortunately, no harm done - and more importantly, the day went well, which is a huge achievement and one I didn't think I'd ever see 