My 3-month old has had green poops for about 3 days now. She's also very fussy, not sleeping well, and a little congested. Could she just have a cold? She doesn't have a fever. I don't think it's a hindmilk/foremilk imbalance because she usually only eats on one side/feeding (helps her reflux a little). She's also been spitting up a lot more than usual, so she's hungry and eating constantly too. Any ideas?