I know its not funny but I can't help laughing at your post. My Trixie sounds just like your baby. She will climb and jump off of anything. During the summer when she was only 6 months old and weighed about your baby's weight she jumped off my mother's deck. It's a good 12 feet

I thought she killed herself but nope, not my Trixie. She went running through the yard and I couldn't catch her little butt. She was perfectly fine. Every once in awhile I'll find her on top of my kitchen table. Chairs are always pushed in so I know she isn't jumping to them and then to the table. I haven't got a clue (just like you) on how she gets on the things that she does. Then I have my other yorkie who's terrified of heights

If anyone has any help I would also really appreciate it