Why do some kids get bitten more while others do not ?

If your three-year-old child is more active and emits more heat, he may attract more mosquitoes than his elder brother.

What you can do is to let him take a shower to keep him cool, and put him in long-sleeved shirts and long pants made of light cotton. And, applying mosquito repellent can protect them from being bitten too.

https://www.asiaone.com/lifestyle/mosquitoes-why-do-some-children-get-bitten-more-others