[Misstiel]

Do you know how old he/she is? If it is older than 1 year old, it is a female. If it is younger than 1 year old, it could be male or female. You could always DNA it to find out for sure. Female pearl cockatiels always keep their pearly mutation while the males lose it after they reach about 1 year old.

 

[Misstiel]

Okay, then you would probably have to DNA it to find out. Do you know the parents' mutations? That could possibly determine what it is.

 

[Misstiel]

You could try wingspot sexing the bird. It worked for my cockatiels, but it's not 100% accurate all the time especially with pied cockatiels. I'll insert the screenshots that I've taken, and you can see if you can find out the gender that way.

 

[Misstiel]

Do you know how old the cinnamon pied cockatiel is? Does it sing lots, and is it very vocal? You could try the wingspot sexing for that tiel, but I find the pied mutations are very difficult since they have many different coloured wings. I tried it with my 4 month old pied cockatiel, and according to that, I thought he was a female but when I DNA'd him, it came back as male.