No signs as a baby, diagnosed at 11 because she struggled to talk, breathe, and walk at the same time. She was always out of breath
My son was about 16 months. Dr said he had to label is allergies at first cause of his age but eventually they officially diagnosed it. My daughter was around 5. My son and daughter use to cough all the time.
My daughter was 4mos. She had rsv and bronchitis. She was wheezing and coughing badly. Those were my signs to take her to the ER
I was 7. Had my first asthma attack right after a vaccine. There is no asthma in my family.