Anywhere from a 4 to a 5, depending on the shoe.

Size 4 is about average for that age- small is 13-1, big is men’s 6-7. Also there is a full size range difference between under armor and other brands- so an under armor 4 is really about a 3. I work in a shoe store. Just throwing out under armor because that’s the most popular brand.

Just turned 9. 4.5.

My 8 soon to be 9 year old wears a 5.5-6.

My 9 yo wears a 3.5, I think.

My 5 year old son wears a 3.5.

3.5; he's tall. My 10 year old wears a 4.

2.5

7 year old son wears size 4.

3.5-4

3.5

2-3 depending on the brand. He is still ok in crocs sized J1....

8 year old is a size 6 and my 6 year old is a size 3.

My 8 year old has really small feet, size 13. His best friend is 9, size 3.

Just curious. My kids foot doesn’t seem to ever stop growing. He is now a 4