Baby cockatiels rely on not just their mother but also their father up to about 12 weeks of age. When a cockatiel pair produces a clutch, which it does twice a year, both parents take active roles. Males and females alike sit on the eggs, and clean and feed the young. When a female cockatiel begins laying, seven to 10 days after mating, she lays one egg every other day, as few as three but up to eight. A clutch of eight eggs, for example would take the hen 15 days to lay. Cockatiel chicks begin hatching after a day period. Accordingly, one egg will hatch every other day, each one taking 21 days from the beginning of its incubation. Both parents remove eggshell bits and clean the hatchlings. They sit on the chicks to keep them warm but don't feed them for 8 to 12 hours after hatching. The chicks will completely absorb their yolk sacs during this time.

Encouraging Parents to Incubate Eggs
How The Flock Do I Care For A Parrot?
I have a pair of cockatiels that I purchased about one year ago, so they are about 15 to18 months old. I was told they were both males, but one is now laying eggs. I was not prepared for this. I took the three eggs out of the cage to prevent breakage, wrapped them in a towel and put them in a bowl. They are on the counter away from the air conditioner or fans.
Hints and tips about buying your cockatiel
Cockatiel General Information Cockatiels as Pets. Breeding Your Cockatiels Common Health Problems of Cockatiels. The female will spend more and more time in the nest box, and she will feed from the cuttlebone and mineral block, the nutrients of which she needs to form the eggshell. At this point it is especially important to provide water for bathing as she needs the moisture for the egg-building process within her, as well as to regulate the humidity in the nest box. One way you will know eggs are on the way within a day or so is that the hen's droppings will be huge compared to what they would be under normal circumstances.
Native to Australia, the cockatiel is a sociable household parrot that usually features gray, yellow or white plumage. Cockatiels possess an average lifespan of about 15 years. Female cockatiels may lay four to seven eggs in a single clutch, laying each egg about two days apart. Ideally, the parents should incubate their own eggs.