diarrhea or normal

Hi mga mamsh. Ask ko lang how will.you know if your new born baby has diarrhea. Kasi yung lo ko first time nag mixed fed. Eh halos nagpoop sya tho 2x palang naman today. I just want to make sure na hiyang sa kanya yung milk. Hipp organic formula ang gamit nya. Tia. Ftm here. ??