If wean is nearer 12 months than 6 you'll be better with baby shoe size three to seven. If wean is just past 6 months then baby shoe size zero to two will be best.
The larger socks are well stretchy (47% wool but washable) with a good turnover at the top. Not much more that I can say...they're socks. They go on feet. Opposite end to heid. OK. They are very comfy and essential for that 'Total Jock' look.