Review on O'Neill Reactor Spring Wetsuit for Toddlers - 2mm Thickness by Ryan Marx

Bought for my 4.5 year old 38 lb 40 inch to wear to swim lessons. Size 3 goes all the way up and size 4 goes all the way down. Choose size 3: it's almost perfect. Fits snugly around the chest and arms as a wetsuit should and there is some room at the waist/hips for rapid growth. It billows out a little at the waist when wet, but not enough to interfere with a swim. The quality of the costume is excellent. I have an O'Neill shorty for wakeboarding and I would say this suit is just as well made as the adult version. There isn't a long zipper at the back, but few 4-year-olds will be able to climb in and out of this piece on their own. This weekend she wore it for the first time in very cold sea water: the combination of wetsuit and life jacket kept her warm. Goodbye. Thinking of ordering one for our 18 month old too.