If your child gets a respiratory illnesses, it can trigger asthma or make the condition worse. Allergies can also trigger this common condition. "If we look at asthma in children, at least 80 percent of children with asthma [have] some degree of allergy sensitivity," says Dr. Stuart Abramson, assistant professor of pediatric immunology at Baylor College of Medicine and staff physician at Texas Children's Hospital in Houston, Texas.

Dust mites and mold are the two most common triggers of asthma. "In addition we know that if infants who are exposed early to these types of allergens are most likely to be sensitized, to dust mites in particular," says Dr. Abramson.

Dr. Abramson says it's important to focus on the bedroom because that's where children and babies spend most of their time. "Initially, it's a good idea to have a dust mite-proof encasement on the mattress," he says. "Or wash the bedding in hot water every week or two. That kills dust mites." Dust mites are found where humidity is high and temperatures warm.

"Running the air conditioner is a good way to reduce the relative humidity in the home," he says. "But in some parts of the country, you may actually need a dehumidifier if it's really humid." And if you do have central air, remember to change the air filter regularly.

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