I found this: There is no limit for children—and not for adults either! Based on what we know about traditional fats and children through the work of Weston A. Price, we need a good amount of the great brain-building nutrients found in egg yolks. If a child is requesting more egg yolk, don’t hold back. Of course, those yolks should be from properly raised, pastured chickens. Think about it this way—we often eat a number of egg yolks quite normally in certain dishes, such as egg yolk custard or an egg frittata. Of course, be sure to offer other nourishing fats (cream, coconut oil, lard, etc.) to widen the variety of nutrients your little one consumes. Chances are your child’s requests will change soon enough. Rejoice in the fact that your wee one is asking for more egg yolks instead of more cookies!
Hope that helps!