Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Asthma Health Center

Font Size

Early Day Care May Lower Asthma Risk

Day Care Attendance Before Age 3 Months May Cut Asthma Risk for Some Children
WebMD Health News
Reviewed by Louise Chang, MD

Oct. 18, 2007 -- Attending day care from early infancy may help protect high-risk children from developing asthma, new research suggests.

Regular day care attendance by 3 months of age was linked to lower levels of immunoglobulin E (IgE) antibodies in the University of Arizona study, but the association was seen only among children whose mothers had asthma or had positive skin tests for allergies.

IgE antibodies trigger the inflammatory responses that cause allergies and related asthma.

Researchers found that the IgE levels of children who started day care in early infancy remained low for at least the first three years of life.

The findings add support to the 'hygiene hypothesis' suggesting that early exposure to germs from different environments helps protect against allergies and asthma caused by allergic responses, researcher Anne L. Wright, PhD, tells WebMD.

"This study doesn't prove cause, but it adds to the evidence suggesting a protective effect by linking day care to this early predictor of asthma risk," she says.

Early Day Care Exposure Is Key

Asthma is the most common chronic disorder in childhood, affecting an estimated 6.2 million children in the U.S. under the age of 18, according to the American Lung Association.

Allergies are important asthma triggers in children, but they are not the only ones. Respiratory infections, secondhand cigarette smoke exposure, exercise, and stress are also important triggers.

In the study, the researchers examined the timing of day care exposure and the specific aspects of exposure that might influence a child's risk of developing allergic asthma.

They found that entering day care before the age of 3 months was associated with decreased IgE levels three years later in high-risk children (those with mothers who had asthma or allergies), but entering day care later in infancy or childhood was not protective.

The finding supports the idea of a "critical window of vulnerability" during which exposures influence the developing immune system, Wright says.

Being outside the home seemed to be a more important predictor of lower IgE levels later in life than the number of other children a child was exposed to.

This finding led the researchers to speculate that regular exposure to germs from two separate environments may play a greater role in immune response than early exposure to other children.

The study is published in the latest issue of the Journal of Allergy and Clinical Immunology.

When Is Your Asthma Worse?

When Is Your Asthma Worse?

Take the WebMD Asthma assessment to get Personalized Action Plan

Start Now

Today on WebMD

Lung and bronchial tube graphic
5 common triggers.
group jogging in park
Should you avoid fitness activities?
asthma inhaler
Learn about your options.
man feeling faint
What’s the difference?
Madison Wisconsin Capitol
woman wearing cpap mask
red wine pouring into glass
Woman holding inhaler
Man outdoors coughing
Lung and bronchial tube graphic
10 Worst Asthma Cities