Could a dry cough in a 6 month old be due to reflux?

What the evidence says

Reflux happens when milk or stomach contents come back up into the tube connecting the mouth and stomach, called the esophagus. It's extremely common in babies and usually peaks around 4 months old, then gets better as babies get older.

Doctors say reflux can sometimes affect the airway too, causing symptoms like coughing, a hoarse-sounding cry, or wheezing. This happens either because tiny amounts of stomach contents reach the throat or lungs, or because the reflux triggers a nerve reflex that causes coughing.

However, these breathing-related symptoms are not very specific to reflux. Many other things cause cough in babies, including colds, congestion, allergies, or irritants in the air. Doctors note that reflux symptoms overlap a lot with normal infant behaviours, making it hard to know for certain reflux is the cause just from a cough alone.

Canadian pediatric guidance is actually cautious here: it recommends against using acid-blocking medicines routinely for reflux in healthy infants, partly because evidence they help symptoms like cough is limited, and these drugs carry some risks like more infections.

If your baby has a dry cough along with poor weight gain, frequent vomiting, feeding refusal, or signs of breathing trouble, it's worth showing a doctor. But an isolated dry cough at 6 months, especially if your baby is otherwise thriving, is more likely from something else, like a mild cold, and reflux should not be assumed as the cause without other supporting signs.