Environmental triggers for allergies.. Smoking parents. Feed the baby. Broad spectrum antibiotics. Preterm birth and frequent pollen

Environmental triggers:
The home environment in the first year of life is very important:
- Smoking parents incites allergies.
- Infant nutrition and early introduction of sensitive foods play a role.
- air pollution.
- Early use of care homes.
- Early use of broad spectrum antibiotics.
- Birth completely before spring and frequent pollen.
They all seem to contribute to sensitization.