Breastfed baby diarrhea?

Kelsey • Baby Girl #1 was born 10/5/17 Baby Girl #2 was born 2/15/19 😊

What constitutes diarrhea in a breastfed newborn? I’m hyper alert to it since my first had allergy issues around 1-2 months. Diarrhea was one of her first symptoms.

This morning LO (3 weeks) had loose, runny poop. It was kind of watery but still seedy. Diarrhea or normal poop?