In Health Watch:A new study shows that babies treated with acetaminophen are developing asthma and other breathing problems at an alarming rate.Kathryn Brown reports.'Come on up here Francis.'8-year old Francis Ofori-Amanfo has been fighting to breathe for half his life.Francis says, 'It makes me start coughing and wheezing.'A recent study suggests his asthma may be a result of the acetaminophen he was given as a baby.Lourdes Ofori-Amanfo says, 'If he had a fever I tried to give him a lot of fluids but if the fever got a little bit higher, I would have to give him the Tylenol.'In a study of more than 200-thousand children in 31 countries, infants who were occasionally given acetaminophen -- most commonly sold as Tylenol in the us -- had a 46 percent higher risk of developing asthma.Monthly use increased that risk 300 percent.Doctors aren't sure of the connection -- but say inflammation is a common characteristic of asthma...Dr. David Resnick, Morgan Stanley Children's Hospital says, 'Basically, acetaminophen decreases the amount of antioxidants which will allows more inflammation in the lungs.'But acetaminophen is the preferred over-the-counter drugs approved to treat high fever in babies -- so parents are left with few choices to treat their sick child.Doctors say they should be cautious about using acetaminophen ... But shouldn't stop using it altogether.Dr. Resnick says, 'If a child does have a high fever or they're ill from the fever, then the parents should use the acetaminophen. But again, if they don't have to use it, where it's a mild fever or mild pain, better to not use it.'In a statement ... The makers of Tylenol say "the results of the study do not establish a definitive causal relationship between therapeutic use of acetaminophen and an increased risk of asthma."'Deep breathe in and out.'All Francis knows is that taking a breath is harder for him ... than for his friends.Kathryn brown ... for CBS News ... New York.