Eggs are a great food, full of protein and vitamins. My concern with your son not liking cereal is that he may not be getting the iron he needs at a critical time for getting it. If he is drinking an iron fortified infant formula than he can rely on that for his iron intake. However, if the formula intake drops off as he eats more solids, than you may want to think about getting him a baby supplement that contains iron. Also, you may want to try and see if he would enjoy an adult dry cereal that is iron fortified.
Dry cereals make good finger food snacks.
Try mixing it with different liquids, such as a favorite juice, or mix in some mashed banana. If you can get him back on to some iron fortified infant cereal, at least occasionally, you would not need to be concerned about adding a supplement to his diet. There is iron in egg yolk, but it is poorly absorbed. Thank you for writing. You should not rely on this information as a substitute for personal medical attention, diagnosis or hands-on treatment.