what size shoes is ur baby? x confused

I haven't got shoes yet because my boy isn't cruising, but a size 4/5 is the "average" for their first pair of shoes, however like anyone their feet can be bigger of smaller than this. My eldest was a size 6 around age 2, however, my youngest seems he is going to a size 6 a lot sooner than that. My best advice is to get baby measured at Clarks for their first pair of pre walkers and then you know you have the right size as they need growing room in them too and a lot of places do a cute little picture for you to keep🥰 x