Hi any sudden changes in poo pattern may mean stomach flu, diarrhea or some virus. Did you feed him any new solids? I will bring him to see PD immediately and make sure you replenish him with water constantly. It could also mean teething as my gal poo a lot when she was teething g the first time but PD will say teething doesn't cause diarrhea . In any case have it checked .is he having fever ? The last time my gals poo pattern changed I believe she may have caught some virus but PD wasn't sure. She eventually developed UTI and blood test also showed virus
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Mum of a chubby boy