We have used these wetsuits for many years. My 6.5 year old is average height but very slim (47 inches and 45 pounds) and just went from 5/6 to 7/8. There's some room for it in 7/8, but it's neither baggy nor baggy. nothing, and it warmed him in water with a temperature of 70 degrees. I just bought a 9/10 for my tall/thin 8 year old (55 inches tall, 65 pounds) and it fits him very well. I love these costumes because they fit my kids' thin builds. I went ahead and bought the 11/12 knowing we would need it in a year or two. But while sticking with 9/10, I noticed that the torso was only about an inch longer but much wider. I would say 2" which would be 4". I was disappointed. I don't think we need such a large increase in girth for such a small increase in length. Shipping 11/12 back.
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