Within the first week, you will start to see some feathers developing. These are the pin feathers that look like simple shafts. At the 10 to 14 day mark, the baby cockatiels appear quite a bit bigger and are four to five times their original size.
In general, 3week old cockatiel babies usually require five feeds per day; 4week old babies require four feeds; 5week old babies need three feeds daily; 6week old baby birds are usually down to two feeds per day; and 7 weekolds usually require only nightly feedings until they are weaned at 8 weeks of age.