This is my first tarantula (and first moult), so my experience on spermathecae sexing is sadly very limited. I'm leaning towards possibly female on this one, but I'd love some more experienced opinions.
I never had my girl when she was that small, but I'm still more inclined to say male. I think the spermathecae would still be more developed than what's visible in that picture. I'd wait for the more experienced people to chime in though
@PidderPeets@boina I initially thought male, but I saw a photo of another sub-adult where people thought it was female because of a little fold? https://imgur.com/bAGmZKk (And now for the life of me I can't find the original post, only the photo of the circled fold.)
But maybe I'll just have to wait a little longer for the next moult! Even if it's a male, it's still young so I should get plenty more years with it.