Boys' sizes start at an 8, which is intended for those around age 7 and run up through size 18. In general, boys' clothing is easier to fit than girls' clothing.
S – 6-7 years. M – 8-9 years. L – 10-11 years. XL – 12-13 years.
Youth Medium size is typically appropriate for children between the ages of 8 and 10. General measurements for this size often fall between 48 and 58 inches in height and 50 to 70 lbs in weight.
Australian shoe sizes are equal to American shoe sizes, so if you're purchasing footwear from a US-based retailer, you should find the fit is the same. If you're buying from a UK-based store, go down 2 sizes. If you're a 7 in Australia, you're a 5 in the UK.
Size 8 is a medium size. Not tiny, small, but average. Look at the catalogs of womens clothes and they usually give you the hip/bust sizes for the sizes you are looking for.
Example: If you wear a US size 8 in women, you will be roughly a US size 6.5 in men.
They're likely to stand somewhere between 4 and 5 feet tall at this age. Their weight will probably be somewhere between 70 and 100 pounds. But at this age, your daughter has likely entered puberty and is at the peak of a growth spurt. They might grow as much as 4 inches a year during this time.
What is size 10 in children's shoes? US size 10 children's shoes are equivalent to 6.5 inches or 16.5cm in length.
Australian sizes are measured the same as the UK. So if you're a 10 in Australia, you'll need a 10 from a UK-based store. If you're purchasing from an American store, you'll need to go 2 sizes smaller. So if you're a 10 in Australia, you're a 6 in the US.
Don't worry too much about what other people think or what is called "age appropriate", wear what makes you feel good. Wear leggings, jeans, shorts, skirts, crop tops and dresses. Whatever makes you feel comfortable and good. Wash your clothing once a week, and make sure that they are stain free.
For example, if your measurements were 36-inch bust, 28-inch waist, and 38-inch hips, you'd fall into the “M” or medium size and US Womens Size 8.
If majority rules, a size 10 has a 36″ bust, 28″ waist and a 40″ hip.