In the United States, the corresponding youth size of a woman’s shoe size 6.5 is around 4.5. The 4.5 is considered a size for older children, which excludes toddlers and newborns.

To convert a woman’s or man’s shoe size to a juvenile size, the foot length must be known. The length of a woman’s size 6.5 shoe is approximately 9.1 inches. The nearest youth sizes are a size 4, measuring 8.75 inches, or a size 4.5, measuring exactly 9 inches. As women’s sizes increase, it becomes more difficult to convert to a juvenile size. There is no exact conversion between a woman’s size 8 and a child’s size 8.