From what i know It's best to keep their feet bare whenever possible until around two. Of course that isn't practical when you're out and about so soft soled shoes are a great option. their feet take quite along time to develop arches and strengthen the ligaments. Hard soled shoes force their feet into an unnatural position and can cause issues if introduced too early. I find tippy toey joeys great and also iwalk/bobux, cos the do have rubber on the sole which makes them suitable for outdoors, but they're still very flexible. They're also made from leather which is another plus.

Mind you I find that a lot of shoe shop salespeople will tell you a different story, but from what I've read and talking to my mchn it seems the soft soles are best for as long as you can find ones that fit.