I ordered this swimsuit for my niece who is in size 6-9months, but I ordered for the summer, so I got size 12-18months, when it came 1)The size is way off, it was newborn baby size:/ fits perfectly on a newborn baby girl. 2) The material is NOT stretchy, like swimsuits are suppose to be, it's made out of some cheep material that you can not stretch!! so if you planning to order this make sure to order couple sizes up:)