Thanks to another reviewer, I bought size 6 for my daughter, who takes a 6.5 - 7 in stride rite.  It's plenty big enough! So glad I didn't get the size 7; I'm a little concerned that it may be too big (and it could be narrower) and she'll trip, but we will see.  I don't think I could have bought a size down.  The shoe seems sturdy and comfortable, and although she's not yet worn it out of the house (because of the weather..), I look forward to her having this useful, waterproof shoe for the summer.  Only downside is that she's proud of being able to take the sandals off herself, and I'm worried that she'll do it at some inconvenient time...