1. Serve more fruits and vegetables. Carrots, green beans, oranges, strawberries: They all contain such immunity-boosting phytonutrients as vitamin C and carotenoids, says William Sears, M.D., author of The Family Nutrition Book (Little Brown, 1999). Phytonutrients may increase the body’s production of infection-fighting white blood cells and interferon, an antibody that coats cell surfaces, blocking out viruses. Studies show that a diet rich in phytonutrients can also protect against such chronic diseases as cancer and heart disease in adulthood. Try to get your child to eat five servings of fruits and veggies a day.

2. Boost sleep time. Studies of adults show that sleep deprivation can make you more susceptible to illness by reducing natural killer cells, immune-system weapons that attack microbes and cancer cells. The same holds true for children, says Kathi Kemper, M.D., director of the Center for Holistic Pediatric Education and Research at Children’s Hospital, in Boston. Children in day care are particularly at risk for sleep deprivation because all the activity can make it difficult for them to nap. How much sleep do kids need? A newborn may need up to 18 hours of cribtime a day, toddlers require 12 to 13 hours, and preschoolers need about 10 hours. “If your child can’t or won’t take naps during the day, try to put her to bed earlier,” says Dr. Kemper.

3. Breast-feed your baby. Breast milk contains turbo-charged immunity-enhancing antibodies and white blood cells. Nursing guards against ear infections, allergies, diarrhea, pneumonia, meningitis, urinary-tract infections, and sudden infant death syndrome. Studies show that it may also enhance your baby’s brain power and help protect her against insulin-dependent diabetes, Crohn’s disease, colitis, and certain forms of cancer later in life. Colostrum, the thin yellow “premilk” that flows from the breasts during the first few days after birth, is especially rich in disease-fighting antibodies, says Dr. Shubin. The American Academy of Pediatrics recommends that moms breast-feed for a year. If this commitment isn’t realistic, aim to breast-feed for at least the first two to three months in order to supplement the immunity your baby received in utero.

4. Exercise as a family. Research shows that exercise increases the number of natural killer cells in adults — and regular activity can benefit kids in the same way, says Ranjit Chandra, M.D., a pediatric immunologist at the Memorial University of Newfoundland. To get your children into a lifelong fitness habit, be a good role model. “Exercise with them rather than just urge them to go outside and play,” says Renee Stucky, Ph.D., a clinical assistant professor of physical medicine and rehabilitation at the University of Missouri Medical School. Fun family activities include bike riding, hiking, in-line skating, basketball, and tennis.

5. Guard against germ spread. Fighting germs doesn’t technically boost immunity, but it’s a great way to reduce stress on your child’s immune system. Make sure your kids wash their hands often — and with soap. You should pay particular attention to their hygiene before and after each meal and after playing outside, handling pets, blowing their nose, using the bathroom, and arriving home from day care. When you’re out, carry disposable wipes with you for quick cleanups. To help kids get into the hand-washing habit at home, let them pick out their own brightly colored hand towels and soap in fun shapes, colors, and scents.

Another key germ-busting strategy: “If your child does get sick, throw out her toothbrush right away,” says Barbara Rich, D.D.S., a spokesperson for the Academy of General Dentistry. A child can’t catch the same cold or flu virus twice, but the virus can hop from toothbrush to toothbrush, infecting other family members. If it’s a bacterial infection, such as strep throat, however, your child can reinfect herself with the same germs that got her sick in the first place. In that case, tossing the toothbrush protects both your child and the rest of your family.

6. Banish secondhand smoke. If you or your spouse smokes, quit. Cigarette smoke contains more than 4,000 toxins, most of which can irritate or kill cells in the body, says Beverly Kingsley, Ph.D., an epidemiologist with the Office on Smoking and Health at the Centers for Disease Control and Prevention, in Atlanta. Kids are more susceptible than adults to the harmful effects of secondhand smoke because they breathe at a faster rate; a child’s natural detoxification system is also less developed. Secondhand smoke increases a child’s risk of SIDS, bronchitis, ear infections, and asthma. It may also affect intelligence and neurological development. If you absolutely can’t quit smoking, you can reduce your child’s health risks considerably by smoking only outside the house, Dr. Kingsley says.

7. Don’t pressure your pediatrician. Urging your pediatrician to write a prescription for an antibiotic whenever your child has a cold, flu, or sore throat is a bad idea. Antibiotics treat only illnesses caused by bacteria, “but the majority of childhood illnesses are caused by viruses,” says Howard Bauchner, M.D., a professor of pediatrics and public health at the Boston University School of Medicine.

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