Jingle Bears bell sweatshirt tagged size 6m, but it seems like it runs a bit bigger. It's narrow fitting all around, but the length is a bit longer than tagged size. It is best to judge fit on the individual child. I feel like it could be worn as 6/9m based on length measurements. Color bleed in some spots on the white puffy paint areas.
Measurements are
11 inches shoulder to hem
9 inches pit to pit
8 inches pit to cuff