Order size 6 for my 6 almost 7 year old. They are intended for thin children and are too big in the crotch area. The waste was too big so I tightened it with straps in the belt. But then the front of the pants became very baggy and bunched up. This is normal size, not tight. I noticed that this is listed as 6x which is at odds with the skinny fit. My daughter is not 6x.