Are you planning to keep your future baby's belly button once it falls off?

I recently learned that some people keep their baby's belly button "stumps". I thought it was so weird as my mom got rid of all of ours and I never even considered that someone might want to hold onto them. I was just reading about it and learned some cultures will plant a tree over the buried belly button. I kind of like this idea. Anyway, I'm curious how many people would keep them, for tree planting purposes or otherwise! Feel free to share your stories below! :-)