J.F.
My absolute favorite are Looping 1 Julbo. My daughter has owned a set of Looping 3 and I'm buying her the Solan Julbo for this summer. Love them--especially because there is no "wrong side up" -- they are designed with babies/toddlers in mind so they cannot put them on wrong! You pay more for them but they have 100% UVA/B/C protection, no hinges (in the toddler version) to break or get hair caught in, AND are virtually indestructible.
You can find them on Amazon or GatorTots.com (friend GatorTots on Facebook for June's coupon code).