2, disadvantages: the baby's whole body bones are not mature, especially the fragile neck. However, babies have to rely on it to support the weight of the whole body when swimming, and they have to jump in the water, even if the water will be lighter! It is also very likely to hurt the spinal nervous system.
Or leave a health hazard years or even decades later. It's hard to find a neck-sleeve swimming ring that fits the baby exactly, whether it's big or small, which hides many safety hazards.
When the baby stays in the water, it is necessary to closely prevent water from entering the ears. Babies do a lot of exercise when swimming, and their ears are prone to water, which is easy to cause otitis media. Babies can't swim for more than 10 minutes at a time. Babies feel insecure when swimming, and they will feel scared and cry.