How long does a cockatiel whistle in three months?

Cockatiels generally start to whistle in about three months, and they start to whistle sooner or later, due to the nature of each parrot. And the learning speed is not universal. Cockatiels will speak earlier if they often hear their own species whistling. The ability of parrots to imitate is relatively strong. If it often hears its owner whistling, it can gradually learn it.