When you are introducing your baby to solid food, you don't yet know what he or she might be allergic to. Petit Organics founder Michelle Muller-Marinis shares a way to figure that out: it's called the 4-Day Wait Rule.
Here's how it works. If the first food you want to introduce into your baby's diet is potato, then for four days, you only feed potatoes. If the child has an allergy, the reaction would materialise in those four days, maybe through a rash or swelling. If nothing happens, then that food is safe and you can introduce a new one -- once more sticking to the four-day test period.
Muller-Marinis explains it in detail in the video, so check it out.
4-Day Wait Rule [Howcast]