5 or 6
usually about size 3 or 4.
Most likely a typical 4 yo girl will wear 9 1/2 to 10 size shoe.
size 1 or 2 1/2
There is no average shoe size for a 15 year old girl. Shoe size can vary and it depends on height.
Depends on the person. Everyone is made differently.
The average shoe size for a 2 year old girl is a US size 8. This size is in Adult size.
Well, if your shoe size is seven, then you can physically wear them. However, it is uncommon to have that shoe size at that age (it is possible though).
most likely 8 or 9
A 7 year old boy might wear a size 1 shoe, or he might wear a size 13. Some 7 year old boys with very large feet might even wear a size 2 or 3 shoe.