There is usually little need to be worried. Traditional summer camps offer a host of activities that require children be more physically active than they are during the schoolyear, so some weight loss is expected. If your son is still a growing boy, and loses more than 15lbs within 3 months there might be reason for concern. But generally no, weight loss over summer camp is expected.
It depends on your height and muscle mass. if you are concerned about your weight you should talk to your doctor about a healthy weight for you.
depends on what the subject is about, if it is about weight, then you should be but not too much. don't get stressed about it and just exercise!
Weight
Weight loss should never be the concern of a child, but the parents. Children that are pressured about weight loss tend to develop an unhealthy self image and may lead to eating disorders.
They should be semi-resistant when around a flame.
5w20 winter, 5w30 summer.
10-40 SAE
One should not be concerned with excessive fat on a baby. Babies carry weight differently at different stages of development. Only a doctor will be able to tell if it is a concern.
It varies. There's no one certain weight a girl that age (or any age, for that matter) should weigh. Talk to your doctor if you're concerned about your weight.
Her pediatrician would be better suited to answer this question if you are concerned. It depends on her health current weight and level of activity.
Use 10w30 in the Winter and 20w50 in the Summer.
This is backward. Cotton should be worn in the summer. It is light weight and breathable, which means it will keep you cooler than man made fabrics.