Hmmm... It's really hard to say. 20 weeks is a tough time to determine gender from anything other than a potty-shot. And that's an awkward angle anyway. (So cute, though!) I do see a small nub of sorts by the bottom, which at this point would indicate boy, I think. But I'm no expert. I mostly study girly bits since I'm number princess number 3 at this point. LOL