It is recommended that babies gradually start to add egg yolk after 6 months of age, because babies are too young, the development of the digestive system is not yet perfect, the gastrointestinal tract is more delicate, if you add egg yolk too early, it may lead to indigestion, nausea, vomiting, diarrhea and other uncomfortable symptoms, and sometimes may also cause food allergic reactions in babies, which is not conducive to the addition of complementary foods in the future. When adding egg yolk to your baby, start with a small amount, and pay attention to whether your baby has nausea, vomiting, diarrhea and other uncomfortable symptoms after eating, if not, you can slowly increase it in the future; if so, you must suspend adding it and try to add a small amount 1-2 days later. Do not add too much at once, so as not to cause indigestion in the baby. If your baby is allergic, you can wait until your baby is a little older before you start adding it, to avoid adding it too early.