The responsible decision would be to find a responsible and reputable breeder, as well as a ton of research in what you need to do to keep the species happy and healthy. THEN... discuss and ask about diet.
Please step back for a bit, regroup, and read many of the nightmares folks put themselves and their baby into! At the cost of the bird's life, all too often!
First off, never adopt an unweaned baby, let alone an egg. All you'll end up with is an unhealthy, emotionally unbalanced bird.
A knowledgeable breeder will work with you to introduce healthy foods to baby's diet while it is still on formula. Then your bird will be super easy to feed right, because he will already know and like healthy foods.
Truth! How many different, experience folks have to say the same things for you to believe these simple truths?
My brownheaded parrot Rookie will be 4 months old on Thursday. She just came home today she was parent raised, then handraised & abundant weaned onto a healthy diet.. fresh veggies, fruits, grains, sprouts, pellets etc. etc.
Talk about well adjusted, well weaned.
1 hour after getting here she settled in for a nice lunch, she ate broccoli, carrots, peas, green beans, kale, corn, rice, quinoa, almond, millet, melon & apple along with some pellets in between.
You can find the photo evidence here:
Chronicles of Rookie
She didn't even take but a minute to acclimate to her new environment, recognize familiar foods & relax.
That doesn't happen just by sheer luck, it happens when you make the responsible decision to let a reputable breeder use their knowledge & experience to raise a well adjusted healthy baby & let them make the determination based on that experience for when your baby is ready to go home.