Most likey 71/2 or 7's
the average foot size for a 12year old is size 5 height is about 5.5
7-8
I think that a 16 year old girl's breast areola size should be around a size 16
breast size should be 36 and stomach size should be 24 and bump should be 36
About 17.45kg
A 14 year old girl should weigh about 105-115 pounds. This is a national average for a height of five foot seven.
54
100 average
94-121
50 stone
A 12-year old girl should wear a size 12/14. If the girl is tall, she may want to go up a size so things will fit better.
There is no average since each girl/woman is different and breast size is based on DNA.