Tylenol is a familiar sight in pharmacies and home medicine cabinets across the country, but parents may think twice the next time they use the popular fever reducer.

"Researchers found the children who used Acetaminophen under the age of one, had a higher chance of having asthma and allergies later on," Doctor Larry Hennessey, an Okemos Allergist, said.

Researchers from New Zealand studied more than 200,000 kids from 31 countries and found children who received Acetaminophen --- the main ingredient in Tylenol --- in their first year of life had a 46 percent higher chance of developing asthma and allergies by the age of six or seven.

"The study raised some important questions," Hennessey said.

Hennessey said the study does not prove the link, it only suggests it, and further research will be needed.

"I wouldn't encourage parents to clean out all their medicine cabinets and clear out all the Tylenol," he said.

Acetaminophen has been on the shelves at your local pharmacy for more than fifty years, so Hennessey said it's not the time for parents to panic, but it is the time to use discretion.

"I think a good recommendation would be to not use Acetaminophen in children under the age of one unless the fever is at least 101.3 or unless you've talked to your pediatrician," he said.

Err on the side of caution Hennessey said, but don't give up the tried and true favorite just yet.