My cousin is ten and has size 11 feet
Nope. My shoe size was 10 when i was 13 years old and my height was 5"7. It is about average. It is kind of hard to say. Size 10 is between average and big.
One size up from a ten year old boy. Or it can be one size down from a twelve year old.
not always because some ten year olds are quite big
no
size 1-5
the average size is AA (double a), my daughter is 14 and she is an A, my 10 year old is AA.
About in a girls size, a 4. In a boys size, a 5.
No way! That's massive for a 10 year old.
you can check that by making your hand a fist and the size of your fist is the size of your heart.
4 1/2
Any size that lets you urinate successfully is fine. Anything else is simply marketing.