I love these sandals.  My son (18 months, size 21) wears them all day.  So I bought my daughter (age 4, size 25) two pairs.  I have bought her several other pairs of pediped shoes (red sandals, boots, and tennis shoes).  She wears a size 25 in all of them, with the insert.  But when these came, they were WAY too big for her foot, even using the insert that came with another pair of pediped shoes.  Because I love these sandals so much (they are washable and so soft and flexible on your little one's feet), I ordered her another pair in size 24.  Buy these shoes, you will not be disappointed!