From time to time, you may find in necessary to step in and take over the feeding responsibilities for a baby cockatiel if the mother is unable to do it herself. The process is time consuming and since baby cockatiels are delicate, just like human babies, take care to feed them the right foods. There are commercial brands of bird formula on the market, which you can buy at your local pet store or vet's office. If, however, in a pinch you need to make your own formula, you can do so at home for little money.
Sterilise and clean all the cooking supplies you will be using to make your baby cockatiel food. An easy way to sterilise is to put the supplies in a pan of boiling water for 10 minutes to kill any potential bacteria. A baby cockatiel's immune system is very delicate and you don't want to impart possibly dangerous bacteria to it.
Place 2/3 cup baby food cereal into a small bowl. You can use any flavour as long as it is either mixed grain or high protein.
Add 1 tsp nonorganic, store-bought smooth peanut butter to the baby food and 1 tsp baby food apple sauce. Do not use homemade or organic. Name brand is your best choice.
Add 1 capful of plain, unflavored Pedialyte to the formula.
Mix the ingredients together with a spoon.
Boil a bottle of water for 10 minutes to sterilise it. You will likely not use all of the water, but having it prepared will make your formula easier to develop.
Add the boiled water to the formula to obtain the proper consistency. If your cockatiel is a newborn, the formula should be very runny and thin. If the cockatiel is older, you can make the formula the consistency of set pudding.
A baby cockatiel's digestive system is very sensitive. Use a food thermometer to monitor the temperature of the formula before feeding it to your bird. The ideal temperature is between 40 and 41.1 degrees Celsius to avoid digestive problems. Use a baby oral syringe to feed your cockatiel. You can get these from your local pharmacy.