Eggs might be the single most nutrient-dense, affordable, versatile first food you can offer your baby. One egg packs 6 grams of complete protein, iron, choline (critical for brain development and chronically under-consumed), healthy fats, vitamin D, and B12 — all in a tiny, inexpensive package.
The old advice to wait until 12 months to introduce eggs was based on the (now debunked) hypothesis that delaying allergens prevents allergies. The science has reversed. The PETIT study (2017) showed that early egg introduction in high-risk infants reduced egg allergy by 78%. Current AAP and USDA guidelines recommend introducing egg alongside other complementary foods starting around 6 months.
Both the yolk and white should be introduced. The old practice of giving "just the yolk first" was based on the idea that the white was more allergenic and should be delayed. Current guidance says to introduce the whole egg. The allergenic proteins in the white are exactly what the immune system needs to be exposed to early.