This is my baby's second pair of Robeez and she loves them!  I almost didn't see the crabs, as they are listed as "boys'" shoes.
As far as sizing goes, these are spot on.  I almost ordered a size down, since everybody says these are huge, but I'm glad I didn't.  The 12-18 month size fit my 16 month old daughter perfectly, with a little room to grow.  I measured her foot before ordering, and it was 4.75" from heel to the end of her big toe.  I hope this helps someone!