Dumb question here: How does toddler shoe sizing work? At daycare, they've requested a harder sole shoe for LO. He's been wearing Roobez, but they want a stronger shoe since he's almost a full time walker. He's 13 months old. I don't know how the sizing works for 13 month old toddlers. I don't know what the best shoe to get him is, that's another question.

So, please explain toddler shoe sizing, so I can grab some off of Amazon and what's a preferred shoe for a 13 month old walking toddler?