We did (boiled) egg yolk as a first solid food at about 6 1/2 months, and I would NEVER do it again. We have no history of any food allergies in our family, and yet the egg yolk made ds horribly sick. He threw up to the point that he was grey and listless. I mean he was heaving. It was horrible. I checked in the allergy forum here and apparently allergy to egg yolk (not just whites) is fairly common. After our experience, and after further research, I would never recommend introducing egg yolk as a first food. Nor would I advocate routinely introducing any solid food before 6 months. It just doesn't seem to be necessary in a breast-fed baby who is nursing well. Sally Fallon seems to be writing from her own (low breast milk supply) experience here, but it doesn't make sense for her to recommend this approach as a general strategy for everyone. I think this is one area where her recommendations really fall down and could actually be harmful. There are plenty of TF foods that are also on the least allergenic list, such as avocado, bananas, chicken, etc. My advice is to pick something from the least allergenic list (Dr. Sears has a list in The Baby Book, or there are lots of lists available online) that is also TF, and start with that when you feel your child is ready (generally after 6 mos.)
I've been thinking about this and wondering whether there are traditional cultures that give egg yolk to infants. Is egg yolk really a traditional baby food? It seems strange to think that indigenous people would boil an egg, scrupulously peel off the white, and feed the yolk to an infant. Does anybody know whether there are traditional cultures that actually do this?