Pooping and teething?

So we think our little one is starting the teething process. She’s about 3 1/2 months so I know still kinda early but she seems to be early for most things. The last few days she’s pooping like crazy. 5/6 times a day. Reallll runny. Today it was green instead of the usual yellow. My MIL says that’s normal with teething but I was wondering if anyone else is experiencing this?