"My 7 year old wore this last week for Halloween. He loves Scooby Doo and really loved it. The size chart on the website is wrong because I ordered a small based on that chart and the costume I received was way too small. Thankfully CelebrateExpress stands by their free returns policy. I was able to get a medium exchange in time for Halloween. My 7 year old is very small for his age, so I would say that the Medium would fit a typical 5 year old, maybe 6."