1 year 3 months old girl | 2 years ago
If my child is allergic, when will I know?
2 years ago
It depends on how often your child has been exposed to the allergen. It typically takes time for an allergy to develop. Each allergic person has a threshold that must be reached before an allergen causes a reaction, and this can take several months. That's why pollen allergies associated with hay fever usually take a few years to develop.