Charlie just turned 4, and he currently wears a 9. I bought him snow boots in a size 10 though hoping they'll last him two seasons before he passes them down to Olive for two seasons. As he gets older his feet have been growing a lot slower.

Olive is 26 months old and flew through sizes 5 and 6 in a couple of months. (Charlie was the same way.) She's in between a 6 and 7 now, and I'm debating getting a 7 or a 8 in snow boots for her. Trying to get the most bang for my buck, but also don't want her to have shoes that are too big because she's a little thing and snow boots are heavy.

How old is your LO and what is their shoe size? How fast do their feet grow?