You can only determine an axolotl’s gender after it’s over three months old because their sexual characteristics aren’t fully developed when they’re young, making it hard to tell just by looking. After they hit the three-month mark, they’ll start showing gender traits, and by 5-6 months old, these traits become really obvious.
Typically, male axolotls have two round bumps between their hind legs, which are super noticeable. Females, on the other hand, basically don’t have these bumps—the area between their hind legs is pretty flat. Plus, males living in the same environment tend to be slimmer than females, so it’s pretty easy to tell them apart.
