Mutation, not breed.
Pied is anti-dimorphic. This means that it can blur the lines between genders. Cockatiels are naturally a dimorphic species as the normal greys are easy to differentiate between sexes when adults. With the pied mutation, either sex could have a clear face (no grey) or a dirty face (grey face).
My first cockatiel is a cinnamon pearl pied hen. Her face is clear. She has her pearls. She also lays eggs.
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I had another pied hen. She was assumed male by the people who found her (unfortunately for her...) and she did wolf whistle... however, males don't lay eggs! And she did have some female traits after all...
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There's a higher chance of your cockatiel being female over male simply due to the cinnamon mutation, however you'll have to wait for either gender type behaviors or wait and see if the tail coloration changes at all.