Havaiana's Toddler Flip-Flop - White size 6 but runs really small

Havaiana's toddler flip-flop/sandal in white, size 6 but runs super small. I think they're more like a 4, you can check out a Havaiana's size chart. These were never worn because they were way too small. I bought them thinking they were a size 6. Non-smoking but pet-friendly home.