I'm so glad I've discovered wetsuits - essential for Irish beach-days! My son wore his Size Small suit to the beach today and even though it's still a bit roomy (he's 2 and a half - but smallish build) it kept him warm for hours in the Irish Sea. These suits are a pretty good fit so I wouldn't recommend buying any bigger than the age guide of the clothes your child ordinarily wears - i bought one for my older child too and they'll both get at least another year out of them:) I'm giving this a four just because it's my first wetsuit purchase so I've nothing to compare to!

- julie harper