Allergic reactions to eggs can show up within minutes to a few days later. Symptoms vary from mild to severe. If your baby has a severe allergy, their symptoms will most often show with within minutes of consuming eggs. Below is a list of signs and symptoms to watch for: - Swelling, hives or rash around the face, mouth, lips and tongue. - Itchiness, hives, redness, rash or eczema. Any changes in skin color. - Congestion, runny nose, or itchy watery eyes - Nausea, vomiting, or diarrhea - Wheezing, breathing difficulty, or coughing, gagging and swallowing difficulty - In extreme cases, loss of consciousness The first few times you introduce eggs to your baby it is a good idea to introduce them on their own without any other common food allergens, especially if your baby is at high risk for an allergy. This way if your little one does experience an allergic reaction; you will be able to pin point egg as being the cause. Be sure to read The Truth About Introducing Food Allergens to Your Baby  for more information.