Fits my tiny 4 almost 5 year old with room to grow for swim class now he will be warm in the waterKeeps the kiddo warm. Very easy on, easy off. Flexible and comfortable to wear. The only problem is there is one small area of pink trip at the bottom that gets snagged by the velcro and has already gotten fuzzy, after a few weeks.I bought the 12 - 18 month size for my tall, 18lbs, 6 month old. It's great quality and I would recommend buying for your baby. We've used it in mid 70 degree lake water and the baby is fine, with no sign of being cold.Easy to put on a toddler and kept him warm! We have tried others and this is the best.My daughter has been wearing these wetsuits since she was 4 months old. They are perfect for keeping her warm in the pool. Easy to adjust and the fit a long time!Very cuteWe ordered based on body length listed on the item description and the size shirt my nephew wears, and unfortunately it just didn't fit right or work for him. We tried it on, realized it wouldn't work for him as too much water would get in and it would not keep him warm as advertised (it was too big around the shoulders and sides and leg openings and rode up on him, pushing against his neck/chin). The seller will not allow us to return it since it was "worn" (tried on?) and its not defective.So I wouldn't order this unless you're 1000% sure it will work for your child. Don't even take it out of the packaging if you're not sure it will work.I measured my son before I bought it as I wasn't sure which size to buy. I bought the 6 month one despite him not being 6 months at the time as this was better measurement size. I have been using it every week at Waterbabies and I love it. The good thing about it being slightly too big is the fact that I know he will grow into it and will last a lot longer. Once he outgrows this size I'll buy the next one up. I have the matching nappy too and have used this brand since he was 8 weeks old. Love Love Love!I'm not quite sure why this has such good reviews. It came up very small and our son is a small 4 month old. The edges are also quite hard and scratchy - especially for a baby who is supposed to be moving around in the water. Unfortunately, we purchased this too far in advance, so it was too late to send it back once we'd actually checked it out. Such a waste of money (£21). I recommend looking elsewhere and trying it on your baby as well as checking out the edges.Bought 6-18months for my son. He’s been wearing it since 8 months, currently 11months, he’s average size if not a bit bigger.Does end up with quite a lot of suit around the shoulders but growing into it now and guess that can’t be helped with a product that has a years age range?Easy and quick to get on and off as all Velcro. (my son doesn’t like the noise when removing but not a product fault)Wear over a swim nappy, didn’t bother with any shorts. Only used in Uk pools so no need for sun protection etc. if was abroad would buy the full length one as I think the Velcro would likely get caught on a ruin a SPF swim suit/t shirt and shorts.Think it probably does keep him a bit warmer and makes him easy to hold in the pool.14 month old was really cold and therefore not enjoying swimming then bought this and he is loving swimming at last!! No more tears :-) Rinses well in cold water after use and dries pretty quickly. I use it with reusable swim nappy only as doesn't fit board shorts underneath. Size was accurate to measurements rather than age as is often the way with baby and toddler items as they're all different!i bought this along with the matching trunks for my 16month old. Its very comfortable, keeps him warm and keeps the nappy dry. If using this just for the beach then its ideal but if for swimming lessons this wont keep the nappy dry so trunks r needed