Baby sick question.

Me & my husband have had a stomach flu and colds this past week & for us it’s pretty much gone but my LO has had this kinda diarrhea poop for 2 days and he has a really stuffy nose & a low grade fever & just overall isn’t feeling good. I’ve given him some Tylenol also

Is this poop worry sum? (It’s more yellowish) When should I take him in?