Average height for an 8 years old girl?

Question

(character for my novel)

Also it would help to know the average heights at the ages of 10 and 12.

She didn't really eat properly when little, and is not very healthy, but still I think that her adult height would be about 5'6''

Answer 1

8 year olds: 4'0

10 year olds: 4'5

12 year olds: 4'10

Answer 2

4'1,for an 8 year old

4,6 for a ten year old

5'1,12 year old