Ordered this for my 3yr old daughter that weighs 35lbs. It does not say what size is for what age. I ordered the size 2-4 but when I received the package it said "size 2-4, for ages 1-2."  Obviously it did not fit and had to send it back for a small. Still waiting for that package. Quality is standard, cheaply made costume but it is what it is. Hope this helps someone with ordering the right size!