Scientists discovered using the product in this way can cause a young child's tiny airways to swell and fill with mucus, triggering severe breathing problems.
What happens is the ingredients can be irritants causing the body to produce more mucus to protect the airway. Researchers add the same goes for generic versions of these products.
Proctor and Gamble says it is very clear on the label that the product should never go under the nose or in the nose for anybody and it shouldn't be used in children under 2.
