Thank you for your replies!
It's good to know that I could keep a baby corn snake in the vivarium I linked for a couple of years as it gives me an idea of size - I was concerned I'd have to keep upgrading the tank as the corn grew up!
I had read on a different forum that if you kept a baby snake in a place too big, it would maybe not thrive and would panic, but from what you guys say it's all about having enough places for the baby to hide so it doesn't feel threatened?
I also saw
this starter kit that says in the description you could keep a baby in here for up to a year, is this correct?
Thanks for all your help guys!