I've got 3 year old twins, and shoes are expensive, so I try to get them on sale wherever possible. But if I saw some winter boots now, for example, how do I judge what size to get?? Their feet haven't grown for about 6 months currently, but I'd imagine a spurt is just around the corner and they might jump a couple of sizes. Who knows how they will have changed in another 6 months. Does anyone have a method for this, or do you just need to take a bit of a gamble??