Does that baby's diarrhea have anything to do with Feng Shui?

What you want to ask is whether the baby's diarrhea at home is related to Feng Shui? This situation has nothing to do with feng shui.

The reason why the baby will have diarrhea is because the baby's intestinal mucosal barrier function is poor and the immune system is relatively immature. Baby diarrhea is mostly caused by non-infection, such as improper feeding, local cold in gastrointestinal tract, food allergy, acclimatization and so on. Therefore, the baby's diarrhea has nothing to do with Feng Shui.