Kid's shoe sizing isn't separated by gender. However, kid's sizes do follow the men's sizing chart. In the US men's shoe sizes start at 7, which is equivalent to a kid's 7.
A child's size 6 then is essentially a men's size 6. Women's sizes in the US are labeled between 1 and 1.5 times the size of men's shoes sizes. Unfortunately, there is no absolute industry standard for sizes. This means that a 7 in one brand may be different than a 7 in another brand. Before buying shoes online, find an outlet to try the shoes on first to find a good fit.