Aww first time mom ka! Ang diarrhea ng breastfed babies is usually okay lang kasi yung yellow, seedy poop nila is normal, pero if it's too frequent or may blood/mucus, kailangan i-check ng doctor talaga para sure it's not an infection. A few of us moms found na staying extra hydrated ourselves and making sure baby's latch is good helps, at kung worried ka talaga, walang masama sa call sa pedia even just for peace of mind!