My relative says let her eat everything, she's already big and hungry.…

My relative says let her eat everything, she's already big and hungry. Don't mess around with introducing every product. The baby needs to eat normal food. Let them get used to their stomach. How is it best to introduce things as relatives say or one product every three days? The baby is 9 months old. I'm introducing mashed yolk now, eating both yolk and white, feeling like the white is swallowing the teeth, there's no sensation of that.