This is a Futafuta set I bought this summer for my daughter's birthday. It's size 70, but I tried it on my 1-year-6-month-old daughter who weighs 10kg and is relatively large (she usually wears size 80-90), and it fit with room to spare. In my opinion, the sizing is generous. I bought it, but I have so many clothes that she hasn't had a chance to wear it. You can wear the top and bottom separately, so it's versatile and convenient!