It was completely my fault. I forgot to close the stair gate at the bottom of the stairs and DS got 6 steps up when my back was turned and fell down. Initially wasn’t too worried as no sign of a head injury and I’d turned around in time to see him fall but when he didn’t stop crying for more than 5 mins I stripped off his jumper and his arm was floppy 
Now back from A&E, everyone was lovely, he’s in a cast and it should be fine within 4 weeks but I just feel plain evil. It’s completely my fault and now he looks like a poor abused kid.
I actually hope SS is called because I want some sort of absolution but I can’t imagine even with their involvement I’d get it.
No other SS concerns or involvement bar a couple of ‘we have to record this but all good’ bruise reports at nursery from him and his sister over the last few years.
Feel like complete shit that I couldn’t keep my baby safe.