This is an adorable outfit.  Perfect for crawling babies.  I bought size 6-9 months.  It fits perfectly but is a "generous fit" design so it is not clingy.  Well constructed, snap crotch for easy diaper changes. My only complaint is a general baby clothes complaint... buttons are hard to fasten on an active, squirmy baby.  Snaps are so much easier! Overall, I am very pleased with this purchase and the Mud Pie brand.