Cockatiel parrots reach adolescence at age of 6 to 8 months.
They become fully adult at the age of 9 to 12 months.
It is suggesation that avoid breeding of cockatiel parrots until they reach the at the age of one year or more.
It will surely result in good breeding.
This information will help you to be a good breeder of cockatiel parrots. So, focus on these lines to produce healthy breeding of pearl cockatiel parrots this year by understanding their behavior.