not sure it's realistic / possible to get these onto a toddlers feet - we bought them based on the size of her feet, but the problem is they would require a lot of force to get her foot into it... since there is no way to lace them, velcro them, or tighten them down after they are on the feet. Imagine buying a tall boot (cowboy boot) that fits your leg / foot perfect with no room to spare - then imagine pushing your foot into it without it giving at all (it would need a lot of force and flexibility, and maybe some oil on the leg)! Then imagine trying to do the same with a 5-6mo toddler's delicate and tender feet :)  So we didn't use these. If you do want to try them then I recommend getting 1 or 2 sizes bigger, especially if your little one won't be walking in them.