I have a Rouen (1 out of 6) that seems to be a bit under the weather. I am assuming they are around 3 weeks- but it is a bit unstable on its feet and wobbles and sways a bit when it’s standing as if it’s a bit out of it. It falls over quite a bit if it runs too fast and if others bump into it. It is eating, drinking, and growing just fine. As of this morning i noticed it had diarrhea which was runny, and a lighter brown. Any ideas?