Reducing a child's exposure to allergy-causing substances such as dust mites may help delay or prevent the onset of hay fever. This may be especially true in children with a family history of allergies.

For reasons that aren't completely understood, allergic conditions such as hay fever have become increasingly common in Western countries. Under normal circumstances, the immune system produces antibodies to defend your body against harmful organisms such as bacteria, viruses and parasites. In fact, some exposure to these organisms may be necessary to stimulate the immune system's proper development. But in an environment where disinfectants and antibiotics are commonly used, such organisms may be in short supply. Your immune system may instead produce antibodies against usually harmless substances such as pollen, mold and pet dander, resulting in the development of allergies.

Researchers have found that children may be less likely to develop allergies if they attend child care centers, live in homes with older siblings or are raised on farms. In such environments, children are exposed to more germs and, as a consequence may be less likely to develop allergies.

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