Add your comments to the bottom of this page. It takes some careful detective work and sometimes the help of medical tests to pinpoint the exact cause of an allergy. One clue may be when the allergy attacks occur. Mold allergies usually develop during damp or rainy weather and can be hard to distinguish from colds. Pollen-related allergies are more common in spring and fall.
Dust mites or pet allergies often cause morning congestion that lasts all year long.
If you have a strong suspicion that your child is allergic to a particular thing, try to keep the offender away for a few days. If Fido seems like a good candidate, send him on a short vacation to a friend's house or the kennel. If your toddler's symptoms calm down after these experiments, you've probably identified the problem. If your own sleuthing doesn't pan out, it's time to see your pediatrician. She will examine your baby and ask lots of questions.