Finally, a shoe was found that fits correctly and comfortably on the child. Due to "wide feet," we couldn't find anything that wouldn't squeeze, but finally, I found the brand that I will shop online without worrying about how it will fit on his little foot!

Update 30/8/22: In the end, the child preferred athletic shoes from another big brand compared to these ones, maybe because he felt more support. I noticed that with these specific shoes, his foot leaned, possibly because they are too soft. I find it difficult to part with them, however, the child didn't appreciate them as I thought he would.