Size will be totally dependent upon the individual's measurements and teenagers come in all sizes. There is no size designation for 15-year-olds.
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.
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depends on how "big" the four year old is
The different places you go, the sizes change. For instance a five year old might have to get a size 7 in order to fit because of the store's sizing. For a 4 year old, generally it is toddler size 4,5, and some cases 6. Make sure it fits well! :)
small most likely
nothing, let them wear what they want.
24 months
It's not an age. It is just a size small. Like if you're 6 years old you might wear a size small or if you're 11years old it's possible to wear size small. It just depends on the size of your body.
size 12 or 14
Six-month-old babies typically wear clothing in sizes labeled as 3-6 months or 6-9 months. It is important to consider the baby's individual size and growth rate when choosing clothing.
It depends how large that 5 year old is. Kinda like asking what size shoe do men wear ?
usually about size 3 or 4.