I just read that babies who receive even one dose of antibiotics within their first 12 months have more than double the risk of developing asthma later on. And that each additional dose increases the possibility by 16%. They have done 8 studies in the US and Canada.
Mason has had antibiotics twice now

does that mean he has a 66% chance of getting asthma?! They say "although kids with asthma may simply get more infections that require antibiotics, the researchers theorize that excessive use of these drugs also decreases the natural exposure to germs and overstimulants the immune system's response to allergens, which may lead to asthma"