I agree with a pp about getting a little more info if you want to buy clothes. As an example, my son is at the 95th percentile for height (meaning he is taller than 95% of all the other kids) and my daughter is 5th percentile (she's pretty small!). At age 2, my son wore size 3T for the length, but struggled with the fit because he is a slim kid. My daughter at age 2 was still wearing 12 month clothes! So, find out more (the photo is a great idea) or consider an non-clothing item. If you go with clothes, I have found that Osh Kosh clothes, while great, tend to fit a bit small, and you'll definitely need a size larger. Another idea is to look for a clothing item that will stretch over several seasons. For example, a jumper out of a mid-weight material that would work in many temperatures, depending on the shirt worn underneath. That way, even if she has to grow into it, there's a better chance of her getting some use out of it.