I got the 12 months size for my 6 month old. Washed and put them in the dryer. Some shrinkage not alot. But that's to be expected. My little guy is about 17lbs and these give him plenty of room to grow. They are a bit big but I expect that as I buy stuff for him to grow into. Would recommend. Super cute. Good quality average thickness. Very happy with them. I got the red set .