I think, having read the story about the woman leaving her baby in the car while she was at work in the USA the other week, that a combination of sleep deprivation, having to go back to work too soon (ie when the baby is still keeping you up all night, and you are still very connected to the baby, in a tangible physical hormonal sense, can conspire to make things like this happen.
I have not left my babies anywhere, well not for more than a few seconds, without remembering them, BUT when ds3 was a week or two old I remember waking from a nap - day or night, I don't even know - and thinking he was not in the bed beside me - and thinking, where is he??! and walking frantically round the house looking everywhere before realising that he was, in fact, sound asleep on the bed, but because of my sleeping/waking/dreaming state I hadn't seen him there.
Babies do affect people's cognitive abilities, and this should be taken far more seriously by a government who is putting parents in the awful position of having to function on a working level while their babies are too small.
Not trying to use it to make a political point but I do think it might be connected iyswim.