Generally speaking, bright swimsuits are more suitable for children. For one thing, children prefer a bright colour; for another, it is more convenient for parents to find their children, especially in case of danger, the lifeguard can rescue them more quickly.
Blue and green swimsuits are less visible in water. Thus, avoid wearing those swimsuits as much as possible.
The safest color is orange. You can find that life jackets and lifeboats are all orange. The reasons are as follows.
Orange light has a longer wavelength in the visible light.
High-visibility orange swimwear can strongly stimulate your optic nerve. Orange is so bright that it can easily draw people's attention, and people will not confuse it with other colors. If an accident occurs during swimming, kids in orange swimwear are easier to be found, so as to get rescue as soon as possible.
Some people said that red light has the longest wavelength and is more conspicuous. A traffic signal also shines red to indicate that drivers must stop. However, it is not suggested to wear a red swimsuit. The argument is as follows.
Generally, sharks are afraid of orange.
As everyone knows, sharks are bloodthirsty. The last thing you want to do when you are in distress at sea is wear a swimsuit with a color like blood.
There is an orange-coloured sea snake in the sea, which can produce a poison to kill the shark or make it ill. Because of the conditioned reflex, sharks are generally afraid of orange. And when sharks see a kid in orange swimwear, they are likely to be scared away.
If you go to the beach with your kids, you can select the orange-coloured swimsuit, which makes you full of energy and can scare off sharks.