I like to think I'm slightly more informed now, but every few days either DH or I will have an "omg I just found out...!" moment. Also how little I knew just a few years back really shocks me!
So my question is as per the title; what huge thing did you not realise about babies before you started this journey?
For me, I remember a couple of years ago hearing my friend who has 2 sons talking to another friend about tearing whilst giving birth. This was a rather big and scary revelation for me!