Don't hesitate to ask for more help if you need it. I'm not an avian vet or an expert at raising baby birds. Rather, I was forced into raising a budgie from an egg when her Mama had a medical emergency and couldn't incubate her eggs. I put her three fertile eggs in an incubator. Only one hatched but I raised Rocky from day one when she was less than two grams. At three and a half weeks she weighed 45 grams. She's now five months old and a happy healthy budgie. I don't know her current weight but I doubt it's much more than 45 or 50 grams. She's large because she's half English budgie. Baby birds often weigh more than their parents right before they wean and learn to fly. After they wean, their crops shrink and they have more streamlined body shaped so they can fly. A chunky baby bird with a big bulging crop would drop like a rock! But before they fledge they do a lot of wing flapping in place, presumably to strengthen their muscles. When they are ready they will suddenly take off and likely crash land somewhere, so watch out! Usually they will begin feeding themselves some before flying so I would offer your baby some of those tiny Harrison's pellets I mentioned. They are only the size of a hulled millet seed which is perfect for babies just beginning to feed themselves and much healthier for them than seed.