We've had diarrhea for two days now, dark green and with foam. It was…

We've had diarrhea for two days now, dark green and with foam. It was normal in the morning, but throughout the day it happens 2-4 times, maybe more. Nothing else bothers us. We're on breast milk/supplement feeding. Where do they put you in the hospital with such thing in an ordinary ward or infectious one? And who treated it? Maybe we can avoid hospitals ?