Bought size 5 for well built three year old ( who looks like a Michelangelos David-  toddler version). Meaning: he is not chicken scrawny but well muscled and trim waist. He swam in these. Length wise they were spot on but fit very much like regular chunky toddler type jeans. He fits better in the Levis denizen skinny jeans. However, they are made well enough and would work fine for a more stout body type or those who like a less slim style jean. My child is robust athletic build without baby fat and they fit all wrong so, if you have a gracile boned child without baby fat: these are REALLY not for you. I think they must be slim fit on the cute chunky monkey little boys. I have vikings apparently. :)