Re green poop : could be one of two things - my DS has an immune allergy to egg and his poo when frog green as a newborn/infant when i had egg and it went through my milk or if he ate something with egg. OR if you are breastfeeding which i'm assuming you are, it can be too much foremilk and not enough hind milk. usually causes tummy aches and green poo i believe. haven't had personal experience with that one though.

birth marks - are you meaning the stalk marks (the red ones?) They disappear over time apparently. DS had two on the back of his head from the way he was sitting in the birth canal apparently. they are meant to disappear over time, although his have just faded. can't see them now cuz he has grown hair. my friends daughter had one on her forehead, it disappeared after a few weeks. His actual brown birth mark is behind his knee and it didn't appear until he was about 18months. haven't seen one on DD. i'm assuming hers will appear later too. she is still quite tan/red.