Not sure I'm putting this in the right topic, so apologies if I've got it wrong... 
I'm doing some forward planning for when DS eventually moves out of his cot and am idly looking at what sort of bed to buy him. I was thinking of just getting him a single bed, because I sort of assumed that toddler beds were just a 'thing' but I've just looked at the John Lewis website that says [the single bed I was looking at] wasn't suitable for children under 4.
I was just wondering if anyone moved their LOs straight to a single bed or if the toddler bed is a mandatory transition? 