It's scary seeing them with nose bleeds. DD had one a few months ago and they told me that while it's uncommon in young babies, it is usually nothing to worry about. It's if you can't stop the bleeding, then it needs to be checked out.

DS woke up this morning with a blood nose and blood over the sheets and pillow. Looked really bad but he was ok.

I'm sure Z will be ok and she will have a great birthday!