This post should probably have been in the GTP forum and not the ETB forum but regardless, the answer is no, baby green tree pythons should not be sexed before reaching 80 - 100 grams which is approximately 10 - 12 months of age. Their tails are extremely delicate and are easily kinked. Sometime the damage doesn't show for months as the animal grows and it is not reversable. Just not worth the risk in my opinion and I've dealt with A LOT of green tree's.

Emerald tree boas are a different story though. They are born significantly large than green tree's and they are far less delicate. An obvious indication is that their tail isn't used as a caudal lure like GTP's. I usually probe emeralds a couple months after birth when they are established feeders.

Hope that helps.

Rico Walder
Signal Herpetoculture
Signal Herpetoculture