Just that really. My just turned 16 month old has been interested in the toilet for a few weeks and very keen to get changed when dirty so on Saturday, despite reservations about her age, we went for it. She's been phenomenal. She takes herself to the potty if she needs it even if you're not in the room (discovered that when I was getting the pram ready in the hall), will let you know accurately if she needs a wee or poo and will also have a wee if you ask her to if you explain we're going out now. Today we've been all over town with zero accidents (actually she's only had two tiny wees on the floor full stop and that was Saturday). Is she a genius?! I think so.