I ordered the smallest size but it was not small enough. My daughter is about 12lbs and very petite. This fit her WAY too big. Luckily I just started using my new sewing machine and I took it in about 1 1/2 inches from both sides. I also sewed the sleeves about half way up and I pulled about 2 inches from the crotch and pined it with a saftey pin. Yes the darn costume was that much bigger, but it's her first halloween so she will wear this costume-it is that cute! I put a big pink bow on the ear and the tail and since she just started doing little growls it's the perfect costume. Nothing else in the stores is really this cute. **Note it was going to cost and extra $25 to ship to Hawaii so I sent it to my mom in CA and she spend about $9 to ship it via USPS**