Do kids feel hotter than adults when its hot and colder than adults when its cold? why are children more likely to fall sick in changing seasons?

Ask one at a time.: Do kids feel hotter when it's hot? No. Do kids feel colder when it's cold? No. It's an individual thing; some people tolerated higher or lower temperatures better than others. The very young and very old tend to be more susceptible to the effects of extreme heat and cold than people in the middle, but once again this is an individual thing, and doesn't mean they "feel" hotter or colder.

Children get more...: ...Illnesses because they've been exposed to less. The immune system needs to be exposed to something in order to develop immunity to it. The more illnesses a person is exposed to, the more immunity is developed.