Buy a few sizes larger than the size chart says! The sizes 4-6 years, 7-10 years and 11-14 years seem to be about the same for my two small skinny children (5 and 7 years). Even when I stretch the belt with my hands, I don't feel or see any noticeable difference between the waist measurements, the actual stretch, or even the actual length of the tights. The size 4-6 was actually slightly looser than the two large sizes, which was odd. I am now trying the smallest women's size for my 7 year old as all the other 3 sizes cut into her waist leaving red marks no matter how I tried to fit her waist/stomach/hips. However, I have to say that the quality of these tights, including the thickness and elasticity, seems good and I'm willing to try again with a much larger size. I ended up sticking with a size 4-6 for my petite 5 year old and they have now been worn and washed 3-4 times with no streaks, tears etc which is surprising considering she is quite rough with them.
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