how is it that kids' feet grow so fast? And then not? If you could predict it, that would be nice. But you can't. They'll go through six months, a year even, and their feet stay the same size. So they wear out the shoes they have, and you buy new ones, and as soon as you do, their feet grow. So you buy new ones a size bigger. And as soon as you do, their feet don't grow for six months, during which time they wear those shoes out and so you buy another pair, but you don't go any bigger because they're just growing into the last pair. And as soon as you buy those, their feet grow two sizes in two weeks.
It makes no sense I tell you.
There'd be money in one of those online calculator that ccould track predicted shoe sizes based on your kid's past patterns.
If not money, there'd be lots of grateful parents with extra money in their pockets.