If you can, get your hands on My Brother Jimi Jazz - DS loved this in the lead up to our HB, and when he saw the placenta he was prepared for it - they describe it as a tree
Can request a copy of my home waterbirth from my friend who has the master, if you like
DS keeps painting pictures at kinder of me with him and his sister in my belly, and me with a new baby in my belly - it's just so normal and lovely to him, and I credit being at the birth with that!