Allergies are a common problem for many families. So you want to be careful when introducing new foods to your little one.
Generally, a good rule is to introduce a new food and then wait for 3 days before introducing a new one. That's because if the baby shows some kind of bad reaction, you'll know what to blame. Also, a good idea would be to give new foods in the morning, so if some kind of reaction appears you won't have το call you doctor in the middle of the night or something.
Vegan foods that are common allergens are: peanuts, soy, nuts, acidic fruits (strawberries, oranges, kiwis etc.), sesame seeds, wheat (gluten).
This of course doesn't mean that you shouldn't give these foods to your child. Just relax and pay attention for any signs of allergy. Oh and if any signs appear, don't freak out! Just call your doctor.