Quote Originally Posted by Toad37 View Post
As far as I'm aware the palpation method (the bump test) only works on boas and only up to a couple years of age. I've never heard of it being done on a bp. Different definitions for different species I guess. Like Deborah said palpating a bp is feeling for eggs.
This. Sexing by palpation is doable-ish in ball pythons, but the window for doing it is pretty narrow. It's really from about a hatchy to ~200 grams that I can kind of tell a difference between make and female babies, then females develop what feels more or less exactly like the "speed bump." Up until then, male tails feel squishy and then solid; female tails feel solid all the way down.

But it's not reliable. Popping or probing are the ways to go, as Deborah said.