My 7 week old just started having greenish poop. It's not totally dark green it's more of a greenish/yellowish. I just started taking Dicloxacillin for mastitas and I wasn't sure if it would change the color of poop. I've read about baby's getting too much foremilk turning poop green so I was thinking maybe that's the problem. He's been nursing every 2-3 hours and I just started nursing mainly on one breast per feeding. Sometimes I use the other breast if he doesn't seem satisfied. Could that be the problem?