Yes. You probably didn't think you'd be buying deodorant for your child this early in the game — and body odor is certainly less common at ages 5 to 8 than at age 12. But a young grade-schooler who needs deodorant is within the normal range of development, says Jennifer Shu, a pediatrician and author of Baby and Child Health.
"Body odor at this age is usually a sign that the body is maturing and the hormones are changing," says Shu. When your child's more "mature" sweat comes into contact with dirt and normal skin bacteria, body odor can result — just as it does for adults.
Also, people vary in terms of how active their sweat glands are. If your child is on the higher end, he'll be more likely to sweat — and to develop body odor when his hormones change.
Daily bathing, clean clothes, and regular laundering of sheets and towels can reduce body odor. It may also help to have your child avoid certain aromatic foods, like onions, garlic, and spicy dishes.
If these methods don't solve the problem, it's fine for your child to start using deodorant or even antiperspirant, Shu says. In most cases, however, a mild deodorant should be enough.
"Antiperspirants are thought to be safe but may be overkill for most kids. They stop the sweat itself — but sweat can be a good thing, since it helps the body cool down," Shu explains.
Deodorant products without antiperspirant are often labeled "natural." If you can't find them in your area, try doing an Internet search for "natural deodorant" to find popular brands that you can either buy locally or order online.
You may want to avoid products that contain phthalates. These chemicals are found in many personal-care products but may be harmful to kids. Find out how to identify phthalates on ingredient labels.
The fact that your child has body odor doesn't mean he'll be shaving anytime soon. True, his body is maturing — but it's a very slow process.
Later on, probably sometime after age 8 or 9, your child will experience a more significant hormonal change. This is when you can expect to start seeing signs of puberty.
In a small minority of cases, body odor might be the result of a condition called precocious puberty, in which a child experiences puberty at a younger-than-normal age. This is very rare. If your child has any signs of it, such as breast development or underarm or pubic hair, contact your doctor.
Otherwise, simply add deodorant to your shopping list. Your child may even like using it, since it's such a "grown-up" thing to do.
ABOVE ANSWER http://www.babycenter.com/404_is-it-normal-for-my…
PERSONAL ANSWER!!! I do research first... All my kids needed it when they entered into first grade. So I have found Kid friendly deoderants. Cause the sweat during PE and Recess.. But once Dylan reached 14, the kid stuff didnt work no more. But he is 6'5" and 275 lbs!