I bought this suit for our 4.5 year old son. He did not like water wings more (which is for babies) and similar swimsuits he found funny. Now we have agreed on this model. I ordered size V (19-21 kg), but because children are so fast. The suit fits perfectly, still has some "air". My son is now wearing size 104 to 110, he can wear the suit safely. The build quality is great and first wash (30 ° C gentle cycle) was not a problem. Now we had our son with the suit into Wassar (about 1.35 m depth) and ... he went under;) Do not worry, it's nothing happening. The principle does not work with passiwen behavior in water. Only when my son began to struggle really hard and perform with the poor swimming movements, succeeded secure hold on the Wassar. Once the "rotation" figured out, he did not want to get out. We have then a time swimming without the suit tried data (only with swimsuit) and see it works great. Although he wants to go with the suit, but I'm sure that in 3 months, which is the latest possible Seepfärdchen to its 5 birthday. Actually, 5 star, but for the fear of the first immersion a star deduction (the suit is holding the child afloat if it does not move, so no lifejacket or so).