The sizing guidelines have some wiggle room. Don't get too stressed about sizing. Follow the general guidelines and you should be fine.
If you're worried about ending up with the wrong size, that's one of many reasons why we offer mixed packs! Go with the two sizes you're trying to decide between. There's a chance they'll both work for you.
One common misconception is that if you are very petit you should get a teen. We strongly recommend basing it off age, as opposed to your outer physique.
Due to the nature of this product, we aren't able to accept returns, but we are willing to give all the help and support we can getting you started using your new Bloody Buddy Cup.