he's been on formula since week 4, the poop was very soft, I gave him water becuase he had not gone in a couple of days - Dr. said he would be constipated for a while during the switch - but I did not expect his poop to change colors.
poop comes in all colors. Only be concerned if it's not coming often enough/is hard balls or is all liquid. Don't worry about poop. Just wait until he starts on solids! Then you'll see the magic of baby poop! :)