Ok, this is a sad situation, I think we can agree on that. Anyone who doesn't already know the answers to these questions has no business hand feeding, and the babies are in grave danger.
HOWEVER, the damage has been done, the babies are with this person now, and they need help.
Formula needs to be between 102 and 110 degrees Fahrenheit, which is 38.9 to 43.3 degrees Celsius. Use a "candy thermometer" or "liquid thermometer" to measure it. Never use a microwave, it can leave hot spots that burn the chick badly and lead to death. If you feed below this temp, the crop (the food sack under the neck) will not empty fast enough and the food will rot in there and poison the baby. If you make it too hot, the food will burn the inside of the crop, and a few days later the burn will actually make a hole all the way through the skin so the food runs out. The burns also cause infection which leads to death.
Feed enough formula that the crop is firm, but not hard. Over stuffing the crop makes it lose its strecthy nature which also leads to sour crop and death. Under filling the crop leads to slow digestion, malnutrition, and possibly death. Base the amount of food on how firm th crop is. I am GUSSING that at the age these babies are, they should be fed 3-4 times a day. Start with four feelings at regular times, and go down to three only when the babies refuse to eat.
Feed the formula with a syringe, which needs to be placed into the beak on the LEFT SIDE OF THE BIRD. That is the birds left side, not yours as you face the bird. This angles the food across the tongue and toward the esophagus where it needs to be. Do NOT put any food in the mouth unless the tongue is moving, and fill very slowly. The head may bob, this is good, just be sure not to injur the chick with the tip of the syringe. If you feed too fast or when the tongue is not moving, you may drown the chick in formula which is called aspiration. I have done this, it happens in an instant.
Keep the chicks at a temperature of 75-85 degrees. If they area panting, they are too hot. If they are huddled together and fluffed up, they are too cold. They should be housed together, not apart, and they should be in a container with solid bottom not a grate. They should be kept on pine shavings at least two inches thick which need to be changed every day. Pine SHAVINGS not needles.
The wings should not be clipped until they are at least six months old. Do not restrict their formula to wean them; they will reject formula when it is time. Begin offering other foods now though, for them to play with. Focus on fresh veggies because Eclectus need them! Also, that is what thee are, Eclectus. Please do Internet search for their proper care and raising.
You must sanitize the feeding intruments after each use or the babies will die of bacterial infections. Never heat formula in a microwave. Heat water in a pan and place the jar of mixed formula in the water to heat that way, be sure to stir very well before taking the temp.
