At the larvae stage, it is impossible to determine the gender of the axolotl.
The nails will darken in pale axolotls and whiten in dark axolotls to indicate sexual maturity, this usually takes place when the axolotl is about five months old.
However, it's usually it's best to wait until the axolotl is 18 months old before trying to sex it with accuracy as some males develop very slowly and can look like females. You may be lucky and the male will develop a prominant bulge in the cloaca region early on in the juvenile stage betraying his gender.
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