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!

