RhinegoldUnisex Childs BostonChildrens Riding Boots

Are they true to size? Im between a 3 and a 4

Is size 3 good size for 13 year old

Is the size 2 a big size 2 suitable for a 9 year old? Or is the biggest size the 13? A bit confused with the sizing of these boots!

What is the width of these boots please